JP4948518B2 - Radioactive substance measuring device - Google Patents

Description

  The present invention relates to a radioactive substance measuring apparatus, and more particularly to a radioactive substance measuring apparatus that uses a collection member that collects radioactive substances such as radioactive iodine in the air.

  Radioactive substance measuring devices are used in nuclear power plants, nuclear fuel processing facilities, medical institutions, and the like. As a typical radioactive substance measuring apparatus, for example, a radioactive iodine monitor (a radioactive iodine sampler) can be mentioned. In the radioactive iodine monitor, radioactive iodine in the air is collected by a collecting member (for example, an activated carbon cartridge), and thereafter, radiation from the radioactive iodine collected by the collecting member is detected. From the detection result, the concentration of radioactive iodine in the air is calculated.

  Patent Document 1 discloses an apparatus for measuring a radioactive substance such as radioactive iodine. The apparatus includes a storage unit that supplies an unused filter, a collection unit that collects radioactive substances by the filter, a detection unit that detects radiation from the collected filter, a collection unit in which a used filter is accommodated, A turntable for transferring the filter and a relatively large airtight container containing the turntable and the like are provided. The filter is transferred from the storage unit to the turntable by free fall. Further, the filter is moved from the turntable to the collecting unit by free fall. At the time of collection, the unused filter on the turntable is used as it is, and also at the time of radiation detection, the collected filter on the turntable is a detection target. A dehumidifying mechanism is provided in the airtight container. This is because the inside of the airtight container is dried to prevent the deterioration of the filter (particularly, the unused filter). More specifically, the turntable is formed with a total of four through holes at intervals of 90 degrees, and a filter is put in each through hole. These filters rotate on the bottom surface of the hermetic container as the turntable rotates.

  Note that FIG. 1 of Patent Document 2 discloses a radioactive iodine monitor having a relatively large airtight box containing a collection unit and a detection unit. A dehumidifying means is provided in the airtight box. As the dehumidifying means, a hygroscopic agent, a heater and the like are disclosed. Patent Document 3 also discloses a radioactive substance measuring device.

Japanese Utility Model Publication No. 2-39188 JP 2006-64521 A JP-A-56-39474

  In a radioactive substance measuring apparatus such as a radioactive iodine monitor, in order to prevent deterioration of the collecting member (decrease in collecting effect), it is desirable to keep it as dry as possible, particularly before use. Therefore, an airtight container and dehumidifying means are used as described above. However, in the devices described in Patent Document 1 and Patent Document 2, since the airtight container is configured as a large container, the volume of the airtight space is inevitably increased, and it is difficult to improve the airtightness. That is, it can be pointed out that it is difficult to increase the dehumidification efficiency. It is particularly an unused collecting member that is desired to be in a dry state, and intensive dehumidification is required at that stage. In addition, it is desired to realize this with a simple configuration.

  An object of the present invention is to provide a radioactive substance measuring apparatus capable of reliably placing an unused collection member in a dry state.

  Another object of the present invention is to provide a radioactive substance measuring apparatus capable of sufficiently dehumidifying only a necessary space with a simple mechanism.

  The present invention includes a supply station that accommodates a laminate composed of a plurality of unused collection members, and collects radioactive substances in the gas to be measured using the collection members sequentially supplied from the supply station. In the radioactive substance measuring device for measuring radiation from the collected radioactive substance, the supply station is disposed in the sealed case, a tower for holding the laminate, a sealed case for enclosing the tower, and the sealed case. A pedestal unit that moves up and down to take out the lowermost collecting member in the laminate through an opening formed in a lower portion of the sealed case. A sealing member is provided for sealing a joint portion between the pedestal unit and the opening in the raised state of the pedestal unit; The base unit closes the opening in the raised position of Tsu DOO, which inside the supply station is sealed by, it is characterized.

  According to the said structure, in the supply station, the whole tower holding the unused laminated body is enclosed by the airtight case, and thereby a local airtight space can be formed. By narrowing the sealed space to a part of the entire apparatus, the airtightness can be improved and the dehumidifying effect can be enhanced. Therefore, it is possible to effectively prevent the unused collecting member from being deteriorated, and particularly to prevent or reduce the deterioration even when the unused collecting member is stored for a long period of time. The lower part of the sealed case has an opening for transferring the unused collection member downward, but after the transfer of the lowermost collection member, the pedestal unit (preferably its upper end) ) Closes the opening. In that case, airtightness is improved by the sealing member provided between the base unit and the opening. The seal member is provided on both or one of them. Since the pedestal unit for raising and lowering the collection member can function as a lid for the bottom surface side opening, the mechanism can be simplified and the manufacturing cost can be reduced compared to the case where a lid is separately prepared. Usually, since the pedestal unit does not function exceptionally during collection and measurement, it is extremely reasonable to use it as a means for closing the opening.

  Preferably, the seal member is provided around the pedestal unit, and the pedestal unit in the raised state and the opening edge of the opening are joined via the seal member. The sealing member may be, for example, an annular elastic member such as an O-ring provided on the side peripheral surface of the pedestal block. A plurality of seal structures may be provided in a multiple manner to improve the sealing performance.

  Preferably, the pedestal unit is provided with an elevating guide fixed to an elevating table and the seal member, and is held by the elevating guide so as to be movable up and down, and has a pedestal surface on which the lowermost collection member is mounted. A pedestal block, and an upper urging means for urging the pedestal block upward with respect to the elevating guide, and after the pedestal block reaches the rising end, the elevating guide to the pedestal unit. The upward movement force given in this way is absorbed by the upward biasing means. According to this configuration, even if excessive motive force is given upward in the raised state of the pedestal unit, it is absorbed by the upper urging means, so that the adhesion of the seal member is improved and the pedestal unit is improved. And an excessive load on the driving mechanism can be prevented. The base block is composed of a single member or a plurality of members.

  Preferably, the pedestal block is provided with the seal member, is held by the lifting guide so as to be movable up and down, and is provided with an intermediate body to which an upward biasing force is applied by the upper biasing means, and the lowermost stage collection. A pedestal main body having a pedestal surface on which a member is mounted and held by the intermediate body so as to be movable up and down, and the pedestal unit further biases the pedestal main body downward with respect to the intermediate body The downward urging force applied to the pedestal body after the pedestal body reaches the lowered end in the lowered state of the pedestal unit is absorbed by the lower urging means. The According to this configuration, even if excessive motive force is applied downward in the lowered state of the pedestal unit, it is absorbed by the downward urging means, so an excessive load is generated on the pedestal unit and its drive mechanism. Can be prevented.

  Preferably, the radioactive substance measuring device further includes a collection station to which an unused collection member is sent from the supply station, and a measurement station to which a collected collection member is sent from the collection station. During the concentration of the radioactive substance at the collection station and the detection of the radiation at the measurement station, the pedestal unit is raised and the inside of the supply station is hermetically sealed. Thus, even when the collection / measurement period is long, the inside of the airtight case is sealed and the dehumidifying means functions, so that the collection member can be prevented from deteriorating.

  Preferably, the sealed case has a box-shaped case main body having a slit on the front side, and a door provided on the front side of the case main body, which opens and closes, and is open to the tower via the slit. And unused collection members are set. According to this configuration, when setting an unused collection member, it is not necessary to remove the entire case, so that it is simple and the inside of the case can be quickly returned to a dry state. It is desirable to provide packing for enhancing airtightness on at least one of the case main body and the door.

  Preferably, the dehumidifying means includes a heater provided in the sealed case. Preferably, the dehumidifying means includes a replaceable dehumidifying agent provided inside the sealed case. The heater is a constant temperature control mechanism.

  As described above, according to the present invention, an unused collection member can be reliably placed in a dry state. Alternatively, only a necessary space can be sufficiently dehumidified with a simple mechanism.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings.

(1) Description of Overall Configuration FIG. 1 shows a preferred embodiment of a radioactive substance measuring apparatus according to the present invention. This radioactive substance measuring apparatus is an iodine sampler that measures radioactive iodine in the present embodiment. That is, the apparatus shown in FIG. 1 collects radioactive iodine in the gas to be measured and measures the radiation from the collected radioactive iodine, thereby obtaining the concentration of radioactive iodine and the like. Of course, the present invention can be applied to other radioactive substance measuring apparatuses.

  In FIG. 1, the iodine sampler is roughly divided into a lower part 10 and an upper part 12, and the lower part 10 is provided with a turntable, a plurality of pedestal units, a lifting mechanism and the like which will be described in detail later. On the other hand, the upper portion 12 is provided with a plurality of station rows, specifically, a supply station 16, a collection station, a measurement station, and a collection station 18. These stations are installed on the top plate 14 as shown.

  The supply station 16 is a station that accommodates unused stacked bodies composed of a plurality of cartridges and sequentially supplies the lowest cartridge. The cartridge is a collecting member including, for example, activated carbon that adsorbs radioactive iodine. The collection station is a station that collects radioactive iodine contained in the gas to be measured using a cartridge. The measurement station is a station that detects radiation from radioactive iodine contained in the collected cartridge. The collection station 18 is a station that receives and collects a cartridge after measurement, that is, a used cartridge.

  The lower part 10 includes a top plate 14, a first intermediate table 20, a second intermediate table 22, and a base frame 24. A space between the top plate 14 and the first intermediate table 20 is a transfer chamber 26, and a turntable described in detail later is rotatably provided in the transfer chamber 26. In the transfer chamber 26, the cartridge is transferred between the stations. The turntable conveys the cartridge in the horizontal direction, and the cartridge is conveyed in the vertical direction by a plurality of pedestal units. This will be described in detail later. An intermediate chamber 28 is provided between the first intermediate table 20 and the second intermediate table 22, and an elevating mechanism described later is provided in the intermediate chamber 28. A basement 30 is provided between the second intermediate table 22 and the base frame 24, and a transmission mechanism and the like are provided in the basement 30. This will also be described in detail later.

  FIG. 2 shows an example of the cartridge. (A) is a top view of the cartridge 34, (B) is a side view of the cartridge 34, and (C) is a perspective view of the cartridge 34. FIG. The cartridge 34 has a disk shape as a whole.

  FIG. 3 shows another example of the cartridge. (A) is a top view of the cartridge 32, (B) is a side view of the cartridge 32, and (C) is a perspective view of the cartridge 32. FIG. The cartridge 32 has a generally disc shape as a whole. More specifically, the cartridge 32 is formed by mounting a hollow disc-shaped rubber packing 32A around a cartridge main body 32B having a disc shape. The rubber packing 32A exhibits a sealing action that further increases the airtightness at the station when the cartridge is accommodated in each station. In the cartridge 32, in order to appropriately collect and measure, the rubber packing 32A may be mounted while the filter paper is sandwiched between the cartridge body 32B. The iodine sampler according to the present embodiment can accept a plurality of types of cartridges.

  FIG. 4 shows a perspective view of the iodine sampler as seen from the right front side. As described above, a plurality of stations are installed on the upper surface plate 14. Specifically, the supply station 16, the collection station 36, the measurement station 38, and the collection station 18 are installed. FIG. 5 shows a state where the door 40B of the supply station 16 is opened. The supply station 16 has a sealed case 40. That is, a stack of a plurality of cartridges (unused cartridges) is accommodated in the supply station 16, and a box-shaped hermetic case 40 is provided so as to wrap all of them. Specifically, the sealed case 40 includes a main body 40A and a door 40B. A front side opening (slit) 40C for replenishing the cartridge is formed on the front side of the main body 40A. A window 40D made of a transparent plate is formed on the door 40B. The door 40B opens and closes with respect to the main body 40A. It is desirable to provide packing or the like for improving airtightness in a contact portion 40E of the door 40B with the main body 40A. The reason for providing such a sealed case 40 is to store unused cartridges in a dry state. That is, when the cartridge adsorbs moisture, the radioactive iodine collecting action is lowered, and therefore the sealed case 40 is provided for storing in a dehumidified state. Note that a dehumidifying means is provided in the sealed case 40, which will be described later.

  FIG. 6 shows a top view of the iodine sampler according to the present embodiment. As shown in the drawing, a circular station array is formed on the upper surface plate 14. Specifically, the supply station 16, the collection station 36, the measurement station 38, and the recovery station 18 are arranged at an angular interval of 90 degrees. Is installed. Incidentally, the cartridge is transferred from the supply station 16 to the collection station 18 in the clockwise direction.

  FIG. 7 shows a state where the sealed case body in the supply unit is removed. However, the bottom plate 46 constituting a part of the sealed case body is illustrated. The supply station 16 includes a tower mechanism 42 and a holding mechanism 44. The tower mechanism 42 accommodates and holds an unused laminate, and the tower mechanism 42 includes a case 50 and an opening / closing bar unit 52. The opening / closing bar unit 52 will be described in detail later with reference to FIGS.

  The holding mechanism 44 includes a drive unit 55 and a pair of horizontal arm units 54. The pair of horizontal arm units 54 is a mechanism that holds the lowermost cartridge in the stacked body in a lateral direction. Each horizontal arm unit 54 has an arm that moves in the horizontal direction and two holding rollers provided at the tip of the arm. The drive unit 55 opens and closes the pair of horizontal arm units 54. The drive unit 55 includes a motor and a plurality of springs.

  FIG. 8 shows a state where the tower mechanism 42 shown in FIG. 7 is removed. As shown in the drawing, the lowermost cartridge 56 is held by a pair of horizontal arm units 54, and a pedestal surface that is an upper surface of the pedestal unit 58 is in contact with the lower surface side of the cartridge 56. The pedestal unit 58 is a unit for transporting the lowermost cartridge downward in the supply station. An opening 60 is formed in the bottom plate 46, and the cartridge is sent downward through the opening 60. When the supply station 16 is in the raised state, the opening 60 and the contact portion of the pedestal unit 58 are sealed to be in an airtight state. That is, the pedestal unit 58 also functions as a member that closes the lower surface side opening 60 of the supply station having an airtight structure in the raised state.

  The collection station 18 has a collection tower 62. The collection tower 62 accommodates a plurality of used cartridges. An opening 62 </ b> A is formed on the upper side of the recovery tower 62, while a base plate 64 is connected to the lower side of the recovery tower 62. The base plate 64 functions as a pedestal, and an opening 66 is formed at the center thereof. Details of the collection station 18 will be described later with reference to FIGS. FIG. 9 shows a state where the collection tower shown in FIG. 8 is removed. An insertion hole 14D is formed in the upper plate 14 at the collection station installation position. In FIG. 9, a part of the pedestal unit 70 protrudes upward from the insertion hole 14D. Two positioning pins 68 are provided in the vicinity of the insertion hole 14D. These positioning pins 68 are engaging members for performing horizontal positioning when the recovery tower is installed.

  FIG. 10 shows a state where the holding mechanism 44 and the bottom plate 46 shown in FIG. 9 are removed. A collection station 36 and a measurement station 38 are provided on the back side of the top plate 14 as shown in the figure. The collection station 36 has a collection chamber case 72. The inside of the collection chamber case 72 is a collection chamber into which an unused cartridge is inserted. The nozzle 74 is connected to the collection chamber case 72, and air that is a gas to be measured is introduced through the nozzle 74. If necessary, a heating treatment is applied to the air in advance, thereby reducing the humidity. The measurement station 38 has a shielding member 76 made of lead or the like.

  FIG. 11 shows a state in which the shielding member 76 shown in FIG. 10 is removed. As shown in the figure, the measurement station 38 has a detector 78 and a case 80 therein, and the inside of the case 80 is a measurement chamber. The collected cartridge is inserted there. Various detectors can be used as the detector 78. For example, a detector in which a high electron multiplier and a scintillator are combined may be used. It is also possible to use a semiconductor detector or the like.

  FIG. 12 shows a state in which substantially all the stations have been removed. The top plate 14 is formed with four insertion holes 14A, 14B, 14C, 14D at an angular interval of 90 degrees when viewed from the center, and each insertion hole 14A, 14B, 14C, 14D corresponds to each station. ing. Similarly, four pedestal units 58, 82, 84, and 70 are provided corresponding to each station. Specifically, in the state shown in FIG. 12, the upper portion of the pedestal unit 58 protrudes upward from the insertion hole 14A. The upper surface is a pedestal surface 58A. In the next collection station, the upper portion of the pedestal unit 82 protrudes from the insertion hole 14B. Reference numeral 82A denotes a pedestal surface, and reference numeral 82B denotes an air discharge path having a funnel shape. In the next measurement station, the upper portion of the pedestal unit 84 protrudes from the insertion hole 14C, and the upper portion is the pedestal surface 84A. In the last collection station, the upper part of the pedestal unit 70 protrudes from the insertion hole 14D, and the upper surface thereof is a pedestal surface 70A. In FIG. 12, the four pedestal units 58, 82, 84, and 70 are all in the raised state. The lowered state will be described later with reference to FIG. In any case, in the present embodiment, a station row is formed along the circumferential direction in the upper portion of the iodine sampler, and a pedestal unit row is formed along the circumferential direction in the lower portion.

  FIG. 13 shows a state in which the top plate 14 shown in FIG. 12 is removed. That is, FIG. 13 shows the structure inside the transfer chamber 26. As shown in the figure, the transfer chamber 26 is provided with a turntable 86 for transferring the cartridge in the horizontal direction. The turntable 86 is a rotating plate and has four transfer openings formed along the circumferential direction. The turntable 86 will be described in detail later with reference to FIGS. Four cutouts are formed along the periphery of the turntable 86, and a latch mechanism 88 is provided for positioning the rotating plate in the rotational direction using the cutouts. Incidentally, the motor that rotationally drives the turntable 86 is fixedly installed on the lower side of the first intermediate table 20. The motor shaft passes through the first intermediate table 20 and is connected to the lower surface of the turntable 86.

  FIG. 14 shows a state where the turntable 86 shown in FIG. 13 is removed. The first intermediate table 20 has four insertion holes 20A, 20B, 20C, and 20D corresponding to the four stations. Four pedestal units 58, 82, 84, and 70 are inserted through these insertion holes 20A, 20B, 20C, and 20D. A rotation shaft 90 connected to the drive motor described above is provided at the center of the first intermediate table 20.

  FIG. 15 shows the same configuration as that shown in FIG. 14, but in FIG. 15, all four pedestal units are positioned at the lower end, that is, the lowered state is shown. In such a state, the pedestal surfaces 58A, 82A, 84A, and 70A that are the upper surfaces of the respective pedestal units are substantially at the same height as the sliding surface 92 that is the upper surface of the first intermediate table 20, that is, the flush state is maintained. It is formed. The sliding surface 92 functions as a sliding surface when the cartridge dropped downward is transported in the horizontal direction. That is, a plurality of cartridges are smoothly transported simultaneously in the horizontal direction by the cooperation of the turntable shown in FIG. In one transport, the individual cartridges are transferred by a rotation angle of 90 degrees, that is, the cartridges are transported by 90 degrees in the horizontal direction between the stations.

  FIG. 16 shows a state where the first intermediate table 20 shown in FIGS. 14 and 15 is removed. That is, a mechanism provided in the intermediate chamber 28 appears. An elevating unit 94 is provided around the intermediate chamber 28. The elevating unit 94 includes two elevating tables 96 and 98, a drive motor 104, a first elevating mechanism 100, a second elevating mechanism 102, and two transmission mechanisms. The lift tables 96 and 98 may be configured by a single plate, but in the present embodiment, a drive motor is disposed between the two lift tables 96 and 98 and weight reduction is performed. Therefore, the common base is composed of two members that move up and down in conjunction with each other. That is, the two lifting tables 96 and 98 function as a common base.

  The lift table 96 is mounted with a pedestal unit 58 and a pedestal unit 82 in the illustrated example. On the other hand, the lifting table 98 is mounted with a pedestal unit 84 and a pedestal unit 70 in the illustrated example. However, the two elevating tables 96 and 98 are simultaneously driven up and down, and they are basically positioned at the same height.

  The driving force of the drive motor 104 is transmitted to the first elevating mechanism 100 via a first transmission mechanism described later. The first elevating mechanism 100 has a guide mechanism for guiding in the vertical direction and a feed screw for driving the elevating table 96 in the vertical direction. The rotational force of the feed screw is transmitted to the second lifting mechanism 102 via a second transmission mechanism which will be described later. Similar to the first elevating mechanism 100, the second elevating mechanism 102 has a guide mechanism for guiding in the vertical direction and a feed screw, and the first elevating mechanism 100 and the second elevating mechanism 102 are interlocked with each other. Perform elevator operation.

  FIG. 17 shows a state where the two lifting tables 96 and 98 shown in FIG. 16 are removed. As described above, the first elevating mechanism 100 includes the guide mechanism 108 and the feed screw 106. Similarly, the second elevating mechanism 102 includes the guide mechanism 112 and the feed screw 110. The driving force from the drive motor 104 is transmitted to the first elevating mechanism 100 via the first transmission mechanism 114 having a belt or the like.

  FIG. 18 shows a state where the second intermediate table 22 shown in FIG. 17 is removed. That is, the mechanism contained in the basement 30 appears in FIG. A second transmission mechanism 116 is provided between the feed screw 106 and the feed screw 110, that is, the second transmission mechanism 116 converts the rotational force of the feed screw 106 into the rotation of the feed screw 110 by the rotational movement of the belt. Is.

  As described above, the iodine sampler according to the present embodiment has a plurality of stations in the upper part thereof and a mechanism for transporting the cartridge between the stations in the lower part thereof. In the configuration shown in FIG. 1, the side surface of the lower part 10 is covered with a predetermined decorative board or the like, but is not shown. A leg portion is provided below the lower portion 10 but is not shown.

(2) Description of Rotation Transfer Mechanism Next, a rotation transfer mechanism will be described with reference to FIGS.

  FIG. 19 shows a turntable 86. The turntable 86 is a mechanism for transporting the cartridge in the horizontal direction. The turntable 86 has a main body 119 having a disk shape and a plurality of positioning mechanisms provided thereon. Further, four transfer openings 118A, 118B, 118C, and 118D are formed in the main body 119 at intervals of 90 degrees along the circumferential direction. Each of the four positioning mechanisms includes a rear positioning unit 120 and a front positioning unit 122.

  20 to 22 show a state where the cartridge 124 is inserted into the transfer opening 118A. 20 is a perspective view, FIG. 21 is a top view, and FIG. 22 is a side view. In FIG. 21, each transfer opening is composed of a circular portion 126 forming a central portion and two rectangular portions 128 and 130 formed on both sides thereof. A positioning unit is disposed in each of the two rectangular portions 128 and 130. The circular portion 126 is a portion for holding the cartridge.

  FIG. 23 shows the operation of the pair of positioning units 120 and 122. (A) shows a fall-down state, and (B) shows a flip-up state. Since the rear positioning unit 120 and the front positioning unit 122 have symmetrical structures, the configuration of the rear positioning unit 120 will be described below as a representative. The positioning unit 120 includes an arm member 132 that performs a swing motion or a seesaw motion about the swing shaft 132A. The arm member 132 is slightly bent at the position of the swing shaft 132A. In other words, the rear part jumps upward from the front part on the cartridge side. A rotation shaft 138A is provided at the front end of the front portion, and a roller 138 is attached to the rotation shaft. The roller 138 is a contact that contacts the side surface of the cartridge and the side surface of the pedestal unit, and is rotatably attached to the rotation shaft 138A. A spring 140 is connected to the rear end of the arm member 132. The spring 140 applies a biasing force to the arm member 132 in a direction in which the arm member 132 always falls. In other words, the arm member 132 falls down due to its own weight, but by further providing a spring 140 and applying a biasing force, it is possible to reliably form a fall-down state in a natural state.

  In the collapsed state shown in (A), the interval between the pair of positioning mechanisms, specifically, the interval defined by the pair of rollers is represented by W1. On the other hand, in the flip-up state, the interval defined by the pair of rollers is represented by W2. As shown, W2 is larger than W1. That is, it is possible to insert a member having a larger diameter in the flip-up state, and on the other hand, in the collapsed state, it is possible to position a member between them by a pair of rollers.

  In this embodiment, when the outer diameter (diameter) of the cartridge is W0 and the outer diameter (diameter) of each pedestal unit is W3, W3 is larger than W0. In this case, W3 may or may not include a dimension including an O-ring provided on the side surface of each pedestal unit.

  In this embodiment, the relationship of W0 ≦ W1 ≦ W3 ≦ W2 is established at least at the supply station and the collection station. Here, W0 and W1 may be substantially the same, and W2 and W3 may be substantially the same. In any case, in this embodiment, the diameter W3 of the pedestal unit is larger than the diameter W0 of the cartridge. This is to block the opening on the lower surface side of the supply station or the like with the pedestal unit. That is, when the diameter of the pedestal unit is smaller than the diameter of the cartridge, it is difficult to seal the opening with the pedestal unit. On the other hand, if the dimensions as described above are set, the pedestal unit The unit can function as a lid member for the opening. However, such a dimension setting causes another problem that when the cartridge is lowered and set on the turntable, the margin is too large and the center of the transfer opening and the center of the cartridge shift. Therefore, in the present embodiment, a pair of positioning units are provided, and the centering is performed as they fall and move. Since the pair of positioning units are in a separated state in which the pedestal unit can be sufficiently passed in the flip-up state, the pair of positioning units does not hinder the movement when the pedestal unit is raised or lowered. Further, in the present embodiment, since each positioning unit is constituted by a roller 138 that can rotate freely, the roller can be freely rotated on the side surface of the pedestal unit. Damage to the provided sealing member is effectively prevented. Even if the seal member bulges from the side surface and protrudes in the lateral direction, the roller 138 can smoothly get over the seal member. Incidentally, it is desirable that the above dimension setting is also adopted in the measurement station. That is, since a certain degree of airtightness is desired also in the measurement station, it is desirable that the pedestal unit be configured to close the opening on the lower surface side as tightly as possible. In addition, since the collection station 18 is usually a station for storing waste, it is basically considered unnecessary to adopt an airtight structure for the opening. However, an airtight structure may be employed on the lower surface side of the collection station for another reason such as entry of dust into the transfer chamber.

  FIG. 24 shows another operation of the pair of positioning units 120 and 122. As described above, the pair of positioning units 120 and 122 exert an action of positioning the cartridge at the center of the opening when the transition is made from the flip-up state to the collapsed state. The functions of 120 and 122 are not limited to this, and the units also function when guiding the cartridge in the horizontal direction.

  That is, paying attention to the rear positioning unit 120, for example, when the center 125 of the cartridge 124 inserted into the transfer opening 118A is deviated from the center of the circular portion 126 (that is, the center of the transfer opening), the turntable is When the cartridge 124 is rotated and sent out in the arc direction indicated by reference numeral 142, the roller 138 hits the rear side surface of the cartridge 124.

  In the roller 138, the central portion 138A is constricted, that is, narrowed, and on the one side, both sides 138B and 138C of the central portion 138A are enlarged, that is, have a large diameter portion. With this configuration, when the roller 138 comes into contact with the cartridge 124, an inward force as indicated by reference numerals 140-1 and 140-2 is applied. That is, the two points or two surfaces of the roller 138 are in contact with the two points or two surfaces on the rear side of the cartridge 124, and a force for feeding the center 125 of the cartridge 124 to the center of the circular portion 126 works. As a result, as the cartridge 124 is moved in the arc direction indicated by reference numeral 142, the center 125 is gradually aligned with the center of the circular portion 126.

  In FIG. 24, the cartridge 124 is depicted slightly smaller in order to clearly show the configuration. Actually, the two positioning units 120 and 122 are always in contact with or very close to the side surface 124A of the cartridge 124, and the positioning action of the roller 138 can be expected also in the front positioning unit 122. For example, when the cartridge 124 is about to escape in the direction orthogonal to the transport direction during the transport of the cartridge 124, the cartridge 124 is positioned near the center of the circular portion 126 by the roller 138 or the like in the front positioning unit 122. Is possible.

  As described above, each of the pair of positioning units has a roller having a unique shape, and each positioning unit can obtain a cartridge positioning action when the positioning unit is tilted down. In particular, it is possible to obtain the cartridge positioning action by the rear positioning unit. Incidentally, in each positioning unit, as described above, the urging force by the spring is applied to the arm member, that is, the arm member is always applied with a force in the tilting direction. Thus, the positioning action can be more effectively exhibited. Further, it is possible to effectively prevent the positioning unit from being inadvertently flipped up when the turntable is rotated.

(3) Description of Lifting Operation and Description of Airtight Method Next, the operation during lifting and the airtight method will be described with reference to FIGS.

  FIG. 25 shows a development view. That is, the four stations are arranged in a circle when viewed from above, but FIG. 25 shows a linear arrangement of the stations in order to clearly represent the operation in each station. As described above, the supply station 16, the collection station 36, the measurement station 38, and the collection station 18 are arranged in the upper portion 12 in the clockwise direction (left direction in FIG. 25). On the other hand, a turntable 86 is provided in the lower part 10, and an elevating unit 94 is provided below the turntable 86. The lifting unit 94 includes two lifting tables 96 and 98 that move up and down in conjunction with each other. Pedestal units 58 and 82 are mounted on the lifting table 96, and pedestal units 84 and 70 are mounted on the lifting table 98.

  26 and 27 are enlarged views of the supply station 16 and the collection station 36 shown in FIG. FIG. 26 is an enlarged view when the pedestal units 58 and 82 are in the raised state, and FIG. 27 is an enlarged view when the pedestal units 58 and 82 are in the lowered state.

  26 and 27, a supply station 16 and a collection station 36 are installed on the upper plate 14. Specifically, the supply station 16 has a sealed case 40. The sealed case 40 includes a bottom plate 46. A laminated body 150 is held in the sealed case 40, and the lowermost cartridge is held by a pair of horizontal arm units 54. In the present embodiment, a heater 152 and a dehumidifying agent 154 are provided in the sealed case 40 as dehumidifying means. The heater 152 is a means for lowering the humidity by heating the inside of the sealed case 40. It is desirable to provide a fan or the like for generating convection with the heater 152. The dehumidifying agent 154 is replaceable, and for example, a silica gel agent or the like may be used.

  As shown in FIG. 27, an opening 60 is formed in the bottom plate 46. Below that, a positioning mechanism 144 and a pedestal unit 58 are provided. The positioning unit 144 is composed of a pair of positioning units as described above. The pedestal unit 58 includes an elevating guide 156 fixed to the elevating table 96, an intermediate body 158, and a pedestal main body 160. The raising / lowering guide 156 is a cylindrical base member, the inside of which is hollow, and the lower part of the intermediate body 158 is inserted into the raising / lowering guide 156 so as to be movable up and down. A concave portion is formed in the upper portion of the intermediate body 158, and a through hole is formed along the central axis thereof. The pedestal main body 160 is inserted so as to be movable up and down across the concave portion and the through hole. Incidentally, the intermediate body 158 and the pedestal main body 160 together constitute a pedestal block. The pedestal main body 160 is composed of an upper part and a lower part. The upper part has a disk-like horizontally extending form, and the lower part has a bar-like form extending downward. The lower end of the base body 160 collides with the stopper 166 when the base unit 58 is lowered. As a result, the lower positioning is performed.

  A spring 162 as an urging means is provided between the lifting guide 156 and the intermediate body 158. The spring 162 urges the intermediate body 158 upward with respect to the lifting guide 156. On the other hand, a spring 164 as an urging means is provided between the intermediate body 158 and the base body 160, and the spring 164 biases the base body 160 downward with respect to the intermediate body 158. Therefore, when the pedestal unit 58 rises and reaches the rising end, the upward movement force thereafter is absorbed by the spring 162. The rising end is defined by the pedestal surface that is the upper surface of the pedestal main body 160 abutting against the lower surface of the lowermost cartridge in the laminate. Conversely, when the pedestal unit 58 moves downward and the pedestal main body 160 abuts against the stopper 166, the downward movement force thereafter is absorbed by the spring 164. At such a lower end, the pedestal surface 58A of the pedestal unit 58 is substantially the same height as the sliding surface 92 which is the upper surface of the first intermediate table 20, as shown in FIG. Incidentally, when the pedestal unit 58 is in the raised state, the positioning mechanism 144 is formed in the flipped-up state as described above, and when the pedestal unit 58 moves downward, the positioning mechanism 144 changes from the flipped-up state to the collapsed state. In this case, a centering force is applied to the cartridge having a diameter smaller than that of the pedestal unit 58 from the lateral direction. In other words, the center of the cartridge can be naturally aligned with or brought close to the center of the transfer opening of the turntable 86. In the raised state, an O-ring 168 placed in a ring-shaped groove formed on the side peripheral surface of the intermediate body 158 is brought into close contact with the lower opening edge of the supply station 16 to form an airtight state. The O-ring 168 slightly protrudes outward from the groove in the natural state.

  Next, the collection station 36 will be described with reference to FIGS. 26 and 27. The collection station 36 also has basically the same structure as the supply station 16 described above, and basically performs the same operation. However, there are differences in some structures and some operations.

  The collection station 36 has a collection chamber case 72 in which unused cartridges are positioned. As shown in FIG. 27, a sleeve member 184 is provided inside the collection chamber case 72 so as to be movable up and down, and a spring 188 is provided above the sleeve member 184. That is, the sleeve member 184 always receives a downward biasing force. The lower edge of the sleeve member 184 functions as the opening 184A. That is, an airtight state is formed by the close contact between the opening 184A and the upper portion of the pedestal unit 82. The sleeve member 184 has a plurality of grooves, and an O-ring 186 is provided in each groove. These O-rings 186 are members for sealing the portions so that air does not flow into the outside of the sleeve member 184. That is, a seal structure necessary for allowing as much air as possible to pass through the cartridge is employed.

  A positioning mechanism 146 and a pedestal unit 82 are provided below the opening 184A. The pedestal unit 82 includes a lifting guide 170, an intermediate body 172, and a pedestal main body 174, similarly to the pedestal unit 58 described above. A spring 176 is provided between the lifting guide 170 and the intermediate body 172, and a spring is also provided between the intermediate body 172 and the pedestal main body 174. Reference numeral 180 denotes a member that forms the lower end of the pedestal main body 174, and abuts against the upper surface of the stopper 178 when the pedestal unit 82 is lowered. The lower end of the pedestal main body 174 has a cylindrical shape and extends downward, and is inserted into the hollow portion of the stopper 178. The insertion portion is indicated by reference numeral 174A. Reference numeral 82A represents a pedestal surface of the pedestal unit 82, and reference numeral 82B represents an air discharge path. Also in this pedestal unit 82, a ring-shaped groove is formed around the intermediate body 172, and an O-ring 182 as a seal member is provided in the groove. As shown in FIG. 26, when the pedestal unit 82 is raised, the opening 184A shown in FIG. 27 and the side surface of the pedestal unit 82 are in close contact with each other, and in particular, the seal member 182 is interposed therebetween. Therefore, it is possible to easily form an airtight state. Incidentally, during the upward movement of the pedestal unit 82, the rising force exceeding the rising end is absorbed by the spring 176, and conversely, the moving force exceeding the lower end in the downward direction is absorbed by another spring. Yes. Therefore, when the pedestal unit 82 is at the lower end, the level of the pedestal surface 82A coincides with the sliding surface 92, and the cartridge can be smoothly fed out in the lateral direction.

  Also in this collection station, the positioning action by the positioning mechanism 146 is exhibited. Specifically, for example, when the cartridge is pulled down, the center can be brought close to the center of the transfer opening, and the turntable When the cartridge 86 is fed forward by rotating 86, the positioning action by the positioning mechanism 146 can be exhibited.

(4) Description of Open / Close Bar Unit Next, the open / close bar unit will be described with reference to FIGS.

  FIG. 28 shows a tower mechanism 42 provided inside the supply station. The tower mechanism 42 includes a case 50 that accommodates an unused laminate, and an open / close bar unit 52 that substantially opens and closes the front opening of the case 50. The open / close bar unit 52 has a pair of bars arranged on the right side and the left side of the front opening. Each bar is preferably composed of a member having a hardness that gently curves when the side surface of the cartridge comes into contact with the bar when the cartridge is inserted. The open / close bar unit 52 opens using the insertion force when the cartridge is inserted, and naturally closes after the cartridge is inserted. In that state, the laminate is restricted from going outside through the opening on the front side.

  FIG. 29 shows the operation of the opening / closing bar unit 52. The open / close bar unit 54 includes a first mechanism 190 and a second mechanism 192. Since the mechanisms 190 and 192 have a symmetrical structure, the first mechanism 190 will be described as a representative. The first mechanism 190 is provided with an arm 196 that is rotatable about the rotation shaft 200. And a bar 194 extending in the vertical direction provided at the tip of the arm 196, that is, the working end. Further, a spring 198 is attached to the arm 196, and the spring 198 always applies a biasing force to the arm 196 in the closing movement direction. The rotating shaft 200 is set on the rear side of the case 50. The second mechanism 192 has the same configuration as the first mechanism 190 described above, that is, the second mechanism 192 includes the arm 204, the bar 202, and the spring 206, and is capable of rotating around the rotation axis 200. is there.

  As shown in FIG. 29, when the cartridge 208 is pushed from the front side toward the inside of the case 50, the pair of bars 194 and 202 come into contact with the front side surface of the cartridge 208. 204 move around the rotation axis 200. At this time, the pair of bars 194 and 202 slide on the side surface of the cartridge 208. When the cartridge 208 is further pushed into the back as it is, the pair of bars 194 and 202 are opened to the diameter of the cartridge 208 and gradually closed from there. Finally, as shown in FIG. 50. In such a state, the urging force in the closing direction is applied to each arm by the action of the spring described above, so that the cartridge 208 does not inadvertently come out to the outside. That is, it is possible to restrict the escape of the cartridge 208. Even when the cartridge 208 is inserted, even if the two bars 194, 202 are widened to the maximum, they will open only as much as the diameter of the cartridge 208, and such maximum opening only occurs instantaneously. Therefore, the cartridge already stored in the case 50 does not come out. In the first place, the laminated body can stand by itself in the case 50.

  FIG. 31 shows a modification. The opening / closing bar unit 209 shown in FIG. 31 includes a first mechanism 210 and a second mechanism 212, and each mechanism includes arms 216 and 222 and bars 214 and 220. However, unlike the open / close bar unit shown in FIGS. 29 and 30, in this modification, the rotation axes of the arms 216 and 222 are set to positions displaced in the left-right direction from the rear center position of the case 50. Specifically, the rotating shaft 218 is the rotating shaft of the arm 216, and the rotating shaft 224 is the rotating shaft of the arm 222. According to such independent rotation axis setting, when the cartridge is inserted, the opening movement can be performed more smoothly. On the other hand, it is more effective that the cartridge comes out after the cartridge is stored. Regulation.

(5) Description of Collection Station Next, a specific configuration of the collection station will be described with reference to FIGS. FIG. 32 shows a state in which the stacked body is accommodated in the collection station 18. FIG. 33 shows a state in which the stacked body is not accommodated in the collection station 18.

  In FIGS. 32 and 33, the collection station 18 has a collection tower 226. This collection tower 226 corresponds to the collection tower 62 shown in FIG. The recovery tower 226 has a slit 226B on the front side thereof, and the inside of the recovery tower 226 can be observed through such a slit 226B. That is, it is possible to easily confirm from the outside how much used cartridges are collected (that is, the height of the laminated body). An opening 226 </ b> A is formed in the upper portion of the recovery tower 226. When the cartridge is discarded, the opening 226A is used. This will be described later.

  A base plate 228 is connected below the recovery tower 226. Two positioning holes 230 corresponding to the two positioning pins are formed on the base plate 228. 32 and 33 show only one positioning hole 230 out of the two positioning holes. A lock mechanism 232 is provided in the other positioning hole. The lock mechanism 232 has a vertical insertion hole 232A, which communicates with the positioning hole. By rotating the handle in one direction, the positioning pin inserted into the insertion hole 232A can be held and locked. If the handle is rotated in the other direction, the positioning pin can be released. More specifically, as shown in FIG. 34, two positioning pins 68 are provided on the upper surface plate 14. Specifically, two positioning pins 68 are provided in the vicinity of the insertion hole 14D through which the pedestal unit 70 is inserted. The positioning pins 68 are inserted with the two positioning holes described with reference to FIGS. 32 and 33, whereby the recovery tower can be set at an appropriate position on the upper surface plate 14. That is, the recovery tower can be attached to and detached from the upper surface plate 14 as will be described below, and the recovery tower can be removed particularly at the time of disposal. 35 is a front view of the collection station 18, and FIG. 36 is a top view of the collection station 18.

  As described above, since the collection tower can be removed at the collection station, as shown in FIG. 37, when it is necessary to discard the laminated body, the collection tower 226 is removed and tilted, By adopting a posture such that the opening 226A at the upper portion is lowered, the laminate 234 can be naturally flowed out from the inside. That is, there is an advantage that the laminate can be discarded very easily.

(6) Description of Overall Operation Next, the overall operation of the iodine sampler according to the present embodiment will be described with reference to FIGS.

  FIG. 38 shows a state in which the collection process and the measurement process are executed. That is, in such a state, the lifting tables 96 and 98 are in a raised state, that is, the four pedestal units 58, 82, 84, and 70 are positioned at the rising end. In that state, the positioning mechanisms 144, 146, and 236 are in the flip-up state. The positioning mechanism 238 is in a collapsed state because the intermediate portion of the base unit 70 is thin. More specifically, in the supply station 16, the pedestal surface of the pedestal unit 58 is in contact with the lower surface of the lowermost cartridge 240. In the collection station 36, the pedestal unit 82 is positioned at the rising end, whereby the cartridge 242 is positioned at an appropriate position for collecting radioactive iodine. In the measurement station 38, the pedestal unit 84 is at the ascending end, whereby the collected cartridge 244 is positioned at an appropriate detection position. In the collection station 18, the pedestal unit 70 is at the rising end, and a used cartridge 246 is inserted therein. The cartridge 246 is positioned above a pair of claw members provided at the lower portion of the collection station 18 for opening and closing movement. Such a claw member is a known member that allows the cartridge to move upward, while restricting the downward movement of the cartridge, that is, supports the stack of used cartridges below.

  When the collection process and the measurement process are completed, as shown in FIG. 39, the pair of horizontal arm units 54 provided in the supply station 16 open and the lowermost cartridge 240 is opened.

  Next, as shown in FIG. 40, the elevating tables 96 and 98 move downward. FIG. 40 shows a temporarily stopped state during the lowering. However, the following operation shown in FIG. 41 may be executed without such a temporary stop.

  In FIG. 41, the holding operation of the cartridge 248 by the pair of horizontal arm units 54 is shown. That is, the next lowest cartridge is indicated by reference numeral 248. The cartridge 240 that was the lowermost cartridge before that is transferred to the pedestal mechanism.

  Next, as shown in FIG. 42, when the elevating tables 96 and 98 are lowered, the respective pedestal units 58, 82, 84, and 70 are individually positioned at the lower ends. In that case, the pedestal surface level of each pedestal unit 58, 82, 84, 70 substantially matches the sliding surface level, that is, a flush state is formed. During the lowering of the lifting tables 96, 98, the positioning mechanisms 144, 146, 236 change from the flip-up state to the collapsed state, and the positioning operation of the cartridges 240, 242, 244 is exhibited in the process. In FIG. 42, the arm members of the positioning mechanisms 144, 146, 236 are slightly lifted upward. Of course, instead of such a state, a state in which each arm member is completely collapsed may occur. The distance between the pair of rollers in the collapsed state may coincide with the outer diameter of the cartridge, may be slightly larger than that, or may be slightly smaller than that.

  Next, as shown in FIG. 43, the turntable 86 is rotated by 90 degrees, whereby the cartridges 240, 242, and 244 are rotated and transferred in the horizontal direction. That is, it is passed to the next station.

  Then, as shown in FIG. 44, the pedestal units 58, 82, 84, and 70 can be positioned at the ascending ends by moving the elevating tables 96 and 98 upward. In that case, in the supply station 16, the pedestal surface which is the upper surface of the pedestal unit 58 comes into contact with the lower surface side of the cartridge 248 to be used next, and the unused cartridge 240 is in the collection station 36. Is positioned in the proper position for collection. In the measurement station 38, the collected cartridge 242 is positioned at an appropriate position for radiation detection, and in the collection station 18, the cartridge 244 after completion of the measurement is added to the lowest stage of the stack.

  As described above, according to the iodine sampler of the present embodiment, first, since the supply station has a sealed structure, the dehumidifying means is disposed inside the supply station to form a relatively small dehumidifying space, and dehumidifying. It is possible to increase efficiency. In that case, since the opening formed in the lower part of the supply station is closed using the pedestal unit, there is no need to provide a separate member for closing the opening, so that the apparatus configuration can be simplified. Is obtained. Moreover, since the seal member is provided around the pedestal unit, it is possible to improve the airtightness between the opening edge of the opening and the periphery of the pedestal unit.

  Secondly, since four pedestal units are mounted on a common base, that is, two lifting tables that move up and down in conjunction with each other, and these lifting tables are driven by a single drive source, There is an advantage that the apparatus configuration can be simplified as compared with the case where the drive source is provided independently. Even in such a case, it is possible to appropriately define the rising end and the falling end using the biasing means in each station, so that there is an advantage that airtightness and measurement sensitivity can be maintained well in the rising state. It is done. Further, since the pedestal surface level can be adjusted to the sliding surface level in the lowered state, there is an advantage that each cartridge can be smoothly conveyed in the horizontal direction.

  Thirdly, since a positioning mechanism is provided for each transfer opening in the turntable and a pair of positioning units are adopted as the positioning mechanism, the center of the cartridge is moved along with the posture change from the flip-up state to the collapsed state. It is possible to match or be close to the center of the transfer opening. Furthermore, since a roller with a narrow center and enlarged both ends is used as a contact in the positioning unit, the cartridge can be positioned naturally only by abutting such a roller from the rear side when the cartridge is transported horizontally. In particular, there is an advantage that positioning in a direction perpendicular to the transfer direction can be performed.

  Fourth, since the open / close bar unit is provided in the supply station, the restriction state can be easily released by simply inserting the replenishment cartridge from the front side, and the restriction state can be naturally generated after insertion. Is possible. Since the pair of opening / closing bars provided in the opening / closing bar unit is composed of a member having a certain degree of softness, no physical load is generated on the cartridge to be inserted. In addition, since such a pair of opening / closing bars has only a softness that curves when the cartridge is inserted, it has a certain degree of hardness, so that the stored cartridge is not prepared. Escape to the outside can be effectively prevented. In particular, in this embodiment, a pair of bars displaced left and right protruding to the front opening is used, so when the cartridge is pushed in from the front side, it is possible to naturally open and close the opening and closing bar with a good balance in the left and right direction. is there.

  Fifth, the collection station is configured so that the collection tower can be removed, and the collection tower can be easily taken out from the upper opening by overturning or tilting the collection tower. There is an advantage that workability at the time can be made extremely good. In addition, a slit is formed on the front side of the collection tower, and the advantage that the number of used cartridges can be confirmed through the slit is obtained.

It is the perspective view which looked at the iodine sampler concerning the present invention from the diagonally left front. It is a figure which shows an example of a cartridge. It is a figure which shows the other example of a cartridge. It is the perspective view which looked at the iodine sampler from diagonally right front. It is a perspective view which shows the state in which the door in a supply station opened. It is a top view of an iodine sampler. It is a perspective view which shows the state which removed the case main body in the supply unit. It is a perspective view which shows the state which removed the tower mechanism further in the supply unit. Furthermore, it is a perspective view which shows the state which removed the collection | recovery tower. Furthermore, it is a figure which shows the state which removed the supply station and the collection | recovery station substantially. It is a figure which shows the state which removed the shielding member in a measurement station. It is a figure which shows the state which removed substantially all the stations. It is a perspective view which shows the state which removed the upper surface board. Furthermore, it is a perspective view which shows the state which removed the turntable. It is a perspective view which shows the state in which each pedestal unit exists in a downward state. Furthermore, it is a perspective view which shows the state which removed the 1st intermediate | middle table and represented the raising / lowering unit. Furthermore, it is a perspective view which shows the state which removed two raising / lowering tables. Furthermore, it is a figure which shows the state which removed the 2nd intermediate | middle table. It is a perspective view of a turntable. It is a perspective view of the turntable with which one cartridge was held. It is a top view of the turntable in which one cartridge is held. It is a side view of the turntable in which one cartridge was hold | maintained. It is a figure which shows the fall state and the flip-up state of a positioning unit. It is a figure for demonstrating the effect | action at the time of cartridge conveyance of the positioning unit. It is an expanded view of an iodine sampler. It is an enlarged view which shows the supply station and collection station in FIG. It is an enlarged view which shows the supply station and collection station in FIG. It is a perspective view of a tower mechanism. It is a figure for demonstrating an effect | action of an opening-and-closing bar unit. It is a figure which shows the state in which the cartridge was accommodated in the opening / closing bar unit. It is a figure which shows the other example of an opening / closing bar unit. It is a perspective view which shows the collection | recovery tower which accommodated the laminated body. It is a perspective view which shows the collection | recovery tower which has not accommodated the laminated body. It is a perspective view which shows two positioning pins. It is a front view of a recovery tower. It is a top view of a recovery tower. It is a figure which shows the state at the time of laminated body discard. It is an operation | movement figure which shows the state in which the collection process and the measurement process are performed. It is an operation | movement figure which shows the state which opened the lowermost cartridge in the supply station. It is an operation | movement figure which shows the state which moves a raising / lowering table below. FIG. 10 is an operation diagram showing a state where the lowermost cartridge is held in the supply station. It is an operation | movement figure which shows the state in which the some cartridge was set to the turntable. It is an operation | movement figure which shows the state which rotated the turntable and conveyed the some cartridge to the horizontal direction. It is an operation | movement figure which shows the state which raised the some cartridge upwards after rotation.

Explanation of symbols

  10 Lower, 12 Upper, 14 Top plate, 16 Supply station, 18 Recovery station, 20 First intermediate table, 22 Second intermediate table, 24 Base frame, 26 Transfer chamber, 28 Intermediate chamber, 30 Basement, 36 Collection station, 38 measurement station, 40 sealed case, 42 tower mechanism, 52 open / close bar unit, 54 pair of horizontal arm units, 58, 82, 84, 70 pedestal unit, 86 turntable, 94 lift unit, 96, 98 lift table, 120 rear Side positioning unit, 122 Front positioning unit, 138 roller, 156,170 Lifting guide, 158,172 Intermediate, 160,174 Base body.

Claims (8)

A supply station that accommodates a stack made up of a plurality of unused collection members is provided, and radioactive materials in the gas to be measured are collected using collection members sequentially supplied from the supply station, and then collected. In a radioactive substance measuring device that measures radiation from collected radioactive substances,
The supply station is
A tower for holding the laminate;
A sealed case enclosing the tower;
A dehumidifying means disposed in the sealed case;
Including
Below the supply station is provided a pedestal unit that moves up and down to take out the lowermost collecting member in the laminate through an opening formed in the lower part of the sealed case,
A sealing member is provided for sealing a joint portion between the pedestal unit and the opening in the raised state of the pedestal unit;
The radioactive substance measuring device according to claim 1, wherein the pedestal unit closes the opening when the pedestal unit is raised, and the inside of the supply station is thereby sealed. The apparatus of claim 1.
The seal member is provided around the pedestal unit,
The radioactive substance measuring device, wherein the base unit in the raised state and the opening edge of the opening are joined via the seal member. The apparatus of claim 2.
The pedestal unit is
A lifting guide fixed to the lifting table;
A pedestal block having the pedestal surface on which the seal member is provided and is held by the elevating guide so as to be movable up and down, and on which the lowermost collecting member is mounted;
Upper urging means for urging the pedestal block upward with respect to the lifting guide;
Have
After the pedestal block reaches the ascending end, the upward motive force applied to the pedestal from the lifting guide is absorbed by the upper urging means. The apparatus of claim 3.
The pedestal block is
An intermediate body that is provided with the seal member, is held so as to be movable up and down by the lift guide, and is given an upward biasing force by the upper biasing means;
A pedestal body having a pedestal surface on which the lowermost collection member is mounted, and held by the intermediate body so as to be movable up and down;
Have
The pedestal unit further includes a downward urging means for urging the pedestal main body downward with respect to the intermediate body.
A radioactive substance characterized in that, in the lowered state of the pedestal unit, the downward urging force applied to the pedestal body after the pedestal body reaches the lowered end is absorbed by the lower urging means. measuring device. The apparatus according to any one of claims 1 to 4,
The radioactive substance measuring device further includes a collection station to which an unused collection member is sent from the supply station, and a measurement station to which a collected collection member is sent from the collection station,
Radioactive material characterized in that, during collection of radioactive material at the collection station and detection of radiation at the measurement station, the pedestal unit is raised and the inside of the supply station is sealed. Substance measuring device. The device according to any one of claims 1 to 5,
The sealed case is
A box-shaped case body having a slit on the front side;
A door that is provided on the front side of the case body and that opens and closes;
Have
An unused collection member is set for the tower through the slit,
A radioactive material measuring apparatus characterized by that. The device according to any one of claims 1 to 6,
The radioactive substance measuring apparatus, wherein the dehumidifying means includes a heater provided in the sealed case. The device according to any one of claims 1 to 6,
The radioactive substance measuring device, wherein the dehumidifying means includes a replaceable dehumidifying agent provided inside the sealed case.

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