JP2016008834A - Radioactivity contamination measurement apparatus for wood and radioactivity contamination measurement system for wood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automate radioactivity measurement of a columnar wood (raw wood with bark), reduce the labor cost and improve radioactivity measurement accuracy.SOLUTION: A radioactivity contamination measurement apparatus for wood comprises a radioactivity contamination measurement part 3 for measuring radioactivity contamination of a wood M. The radioactivity contamination measurement part 3 comprises: a plurality of wood support rollers 17 which support the columnar wood M in the sideways-fallen state; a motor 18 for wood rotation which rotates the wood M in a circumferential direction in accordance with rotational drive of the wood support rollers 17; a radiation detection part 22 which detects a radiation; a cylinder 24 for detection part elevation which moves the radiation detection part 22 upward/downward (approach/separation) with respect to the surface of the wood M; and a control part 7 which automatically measures radioactivity contamination on the surface of the wood M by bringing the radiation detection part 22 close to the surface of the wood M and rotating the wood M in the circumferential direction.

Description

  The present invention relates to a radioactive contamination measuring device for wood and a radioactive contamination measuring system for wood that measure radioactive contamination of columnar wood.

  Since the accident at the nuclear power plant, radioactive contamination due to radioactive cesium has been a problem even in timber that is cut down due to contamination of standing trees (logs) such as forests. The radioactive contamination of wood is thought to be mainly caused by the adhesion of dust, etc. due to accidents at nuclear power plants. According to previous surveys, all the epidermis of forest trees has been uniformly contaminated. However, since the degree and range of contamination differ depending on the part of the wood, contaminated wood and uncontaminated wood are mixed. Therefore, safety cannot be evaluated unless all the surfaces of the columnar timber (logged wood with bark) that has been felled and carried are measured. In particular, in the case of wood used as a building material for residences, it is difficult to eliminate the reputational damage without a mechanism for accurately evaluating the safety.

  Conventionally, radiation detectors such as GM survey meters and plastic scintillators have been used for measuring the radioactivity of wood (see, for example, Patent Documents 1 and 2). Usually, the measurer measures the radioactive contamination in the entire circumference of the columnar timber by holding the radiation detector by hand and moving the radiation detector along the surface of the timber in a lying state.

JP 2012-58097 A JP 2014-106060 A

However, in the conventional measurement of radioactive contamination of wood, since the whole surface of wood is measured manually, there are the following problems.
(1) Since measurement takes time, labor costs are heavy.
(2) It is difficult to keep the distance between the radiation detector and the wood constant, and measurement errors are likely to occur.
(3) The surface of the raw wood has nodes and epidermis, and it is difficult to measure with high accuracy unless the distance between the radiation detector and the measurement site is kept constant. May occur.
(4) It is necessary to take measures to prevent exposure of the measurer.
(5) It is necessary to manually record and aggregate measurement results.

The present invention has been created in view of the above circumstances and has been created for the purpose of solving these problems, and the invention of claim 1 is directed to radioactivity for wood for measuring radioactive contamination of columnar wood. A pollution measuring device, comprising a plurality of wood support rollers for supporting the wood in a laid state, a wood rotating means for rotating the wood in a circumferential direction based on a rotational drive of the wood support roller, and radiation for detecting radiation A detection unit, a detection unit moving unit that always moves the radiation detection unit closer to or away from the uneven surface of the wood at a constant distance, the radiation detection unit is brought close to the surface of the wood, and It comprises automatic measurement control means for automatically measuring radioactive contamination on the surface of the wood by rotating the wood in the circumferential direction.
Further, the invention of claim 2 is the radioactive contamination measuring apparatus for wood according to claim 1, further comprising a second detector moving means for moving the radiation detector in the length direction of the wood, and the automatic The measurement control means automatically measures radioactive contamination in the entire circumference of the wood by moving the radiation detection unit in the length direction of the wood every time the wood rotates once. .
Further, the invention of claim 3 is the radioactive contamination measuring device for wood according to claim 1 or 2, wherein a plurality of the radiation detection units are arranged along a length direction of the wood. .
Moreover, the invention of claim 4 is the radioactive contamination measuring device for wood according to any one of claims 1 to 3, wherein the radiation detection unit includes a marking means for marking the surface of the wood, The automatic measurement control means is characterized in that when the detection value of the radiation detection unit exceeds a predetermined threshold, the marking means is operated to mark the contaminated portion of the wood.
The invention of claim 5 is a radioactive contamination measuring system for wood for measuring radioactive contamination of columnar wood, and is supplied from a wood carrying-in part into which the wood is carried in and from the wood carrying-in part. A radioactive contamination measuring unit that automatically measures radioactive contamination always at a fixed distance with respect to the uneven surface of the wood, a plurality of wood carrying-out units from which the measured wood is carried out, and measurement A timber transporting section that transports the timber from the radioactive contamination measuring section to the timber unloading section, and the timber transporting section serves as a transport destination of the timber according to the measurement result in the radioactive contamination measuring section It is characterized by sorting the wood carry-out part.
Moreover, the invention of claim 6 is the radioactive contamination measuring system for wood according to claim 5, wherein the radioactive contamination measuring unit includes a plurality of wood supporting rollers for supporting the wood in a lying state, and the wood supporting A wood rotating means for rotating the wood in the circumferential direction based on a rotational drive of a roller; a radiation detecting section for detecting radiation; and a detecting section moving means for causing the radiation detecting section to approach / separate the surface of the wood. And an automatic measurement control means for automatically measuring radioactive contamination on the surface of the wood by rotating the radiation detecting unit close to the surface of the wood and rotating the wood in the circumferential direction. And
The invention according to claim 7 is the radioactive contamination measuring system for wood according to claim 6, wherein the radioactive contamination measuring unit moves the radiation detecting unit in a length direction of the wood. The automatic measurement control means automatically moves the radiation detection unit in the longitudinal direction of the wood every time the wood rotates once, thereby automatically causing radioactive contamination in the entire circumference of the wood. It is characterized by measuring.
The invention according to claim 8 is the radioactive contamination measuring system for wood according to claim 6 or 7, wherein a plurality of the radiation detection units are arranged along a length direction of the wood. .
Further, the invention of claim 9 is the radioactive contamination measuring system for wood according to any one of claims 6 to 8, wherein the radiation detection unit includes a marking means for marking the surface of the wood, The automatic measurement control means is characterized in that when the detection value of the radiation detection unit exceeds a predetermined threshold, the marking means is operated to mark the contaminated portion of the wood.

According to the invention of claim 1 or 6, since it becomes possible to automate the radioactivity measurement of columnar timber (bark with bark), labor costs can be reduced compared with the case of manual measurement. In addition, measures to prevent exposure to the measurer are not required. Moreover, since measurement errors due to manual work and variations in measurement results are suppressed, the accuracy of radioactivity measurement can be improved.
Moreover, according to the invention of Claim 2 or 7, it becomes possible to automatically measure the radioactive contamination in the entire circumference of the wood.
According to the invention of claim 3 or 8, the measurement time can be shortened.
Moreover, according to the invention of Claim 4 or 9, since it becomes possible to visually confirm the contaminated part of the wood, the amount of radioactively contaminated wood can be reduced by removing only that part. .
Further, according to the invention of claim 5, it is possible to realize a sorting function for automatically distributing wood according to the radioactivity measurement result.

1 is an overall plan view of a radioactive contamination measuring system for wood. 1 is an overall front view of a radioactive contamination measuring system for wood. 1 is an overall left side view of a radioactive contamination measuring system for wood. It is a top view of a timber carrying-in part. It is a left view of a timber carrying-in part. It is a left view of a radioactive contamination measuring part. It is a partial front view of a radioactive contamination measuring part. It is a left view of the 1st wood carrying-out part. It is a top view of the 2nd wood carrying-out part. It is a right view of the 2nd wood carrying-out part. (A)-(D) are explanatory drawings which show the measurement operation | movement of a radioactive contamination measuring part. It is explanatory drawing which shows the coloring operation | movement of a radioactive contamination measuring part. It is a block diagram which shows the input / output of a control part. It is a flowchart of automatic radioactivity measurement control. It is a flowchart of carrying-in part control. It is a flowchart of measurement part control. It is a flowchart of conveyance part control.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, in the following description, the lower side of FIG. 1 is “front”, the upper side of FIG. 1 is “rear”, the left side of FIG. 1 is “left”, and the right side of FIG.

  1 to 3, reference numeral 1 denotes a radioactive contamination measuring system for wood that measures radioactive contamination of wood M. The radioactive contamination measuring system for wood 1 is a columnar wood (raw wood with bark). The wood carrying-in part 2 into which M is carried in, the radioactive contamination measuring part (the radioactive contamination measuring device for wood) 3 which automatically measures the radioactive contamination of the wood M, and the contaminated wood M are accommodated and carried out. A first wood unloading unit 4 for storing, a second wood unloading unit 5 for storing and unloading uncontaminated wood M, and a wood unloading unit 4, 5 And a control unit (automatic measurement control means) 7 for controlling the entire system.

  As shown in FIGS. 1 to 3, in the radioactive contamination measuring system 1 for wood according to the present embodiment, a columnar (log) wood M that is a measurement object is always handled in a horizontally lying state along the left-right direction. The wood carrying section 2 is arranged on the front side, the radioactive contamination measuring section 3 is arranged along the rear side of the wooden carrying section 2, and the wooden carrying section 6 is arranged along the rear side of the radioactive contamination measuring section 3. In addition, the first timber unloading section 4 is arranged along the rear side of the timber transport section 6. Moreover, the wood conveyance part 6 is extended rightward from the back of the radioactive contamination measurement part 3, and the 2nd wood carrying-out part 5 is arrange | positioned along the rear side of the extension part.

  As shown in FIGS. 4 and 5, the wood carry-in unit 2 includes a strong iron frame 8, a pair of left and right chain conveyors 9 disposed on the left and right sides of the upper end of the frame 8, and the chain conveyor 9. The carrying-in part conveyance motor 10 to drive and the carrying-in part wood sensor 11 (refer FIG. 13) which detects the presence or absence and position of the wood M in the wood carrying-in part 2 are comprised. Each of the left and right chain conveyors 9 includes a pair of front and rear sprockets 12 and 13 and a transport chain 14 wound between the pair of front and rear sprockets 12 and 13. The left and right rear sprockets 13 are driven to rotate via the drive shaft 15.

  A columnar timber (raw wood with bark) M is placed on the timber carry-in section 2 using a forklift or the like. The timber M placed on the timber carry-in section 2 is in a sideways posture along the left-right direction, and the lower sides on both the left and right sides are supported by the left and right chain conveyors 9. When starting the measurement, the left and right chain conveyors 9 convey the wood M rearward in accordance with the driving of the carry-in section conveyance motor 10, and the carry-in section when one piece of wood M falls from the rear end of the chain conveyor 9. The drive of the conveyance motor 10 is stopped.

  As shown in FIGS. 6 and 7, the radioactive contamination measuring unit 3 includes a lower frame 15 configured to be slightly lower than the wood carry-in unit 2 and a lower frame 15 as a strong iron frame. And an upper frame body 16 standing upright. The lower frame 15 includes a pair of front and rear wood support rollers 17, a wood rotation motor (wood rotation means) 18 that rotationally drives the wood support rollers 17, and a wood discharge cylinder 19 that discharges the measured wood M ( 13), a measurement unit wood sensor (see FIG. 13) 20 for detecting the presence or absence of wood M in the radioactive contamination measurement unit 3, an introduction guide 21a for guiding the introduction of the wood M, and a guide for discharging the wood M. A discharge guide 21b is provided.

  On the other hand, the upper frame 16 includes a radiation detection unit 22 that detects radiation, a detection unit support frame 23 that suspends the radiation detection unit 22 so as to be movable up and down, and a detection unit elevating cylinder ( A first detection unit moving means) 24, a balance cylinder 25 that adjusts the push-down force of the radiation detection unit 22, a slide support unit 26 that supports the detection unit support frame 23 so as to be slidable left and right, and a detection unit support frame 23. A detection unit slide motor 27 that moves in the left-right direction, a tank 28 in which coloring ink is stored, and a nozzle 30 that injects ink in accordance with the driving of the coloring pump 29 (marking means) to provide a mark. Is provided.

  The pair of front and rear wood support rollers 17 are arranged in parallel at the front and rear with a space smaller than the diameter of the columnar wood M, preferably about a radius, and the wood M introduced from the wood carry-in portion 2 is: As shown in FIG. 6, it is supported on a pair of wood support rollers 17. The wood rotation motor 18 drives the pair of wood support rollers 17 to rotate in the same direction via the transmission chain 31 and the roller drive shaft 32, respectively. When the pair of wood support rollers 17 are rotated in the same direction, the wood M supported on the pair of wood support rollers 17 rotates in the circumferential direction.

  The wood discharge cylinder 19 is disposed below the pair of wood support rollers 17, and raises and lowers the discharge member 33 disposed between the pair of wood support rollers 17. As shown in FIG. 6, the upper surface of the discharge member 33 is inclined in a front-rear and rear-lower state, and when the upward movement is performed according to the extension operation of the wood discharge cylinder 19, the discharge member 33 moves upward from between the pair of wood support rollers 17. While projecting, the wood M is pushed upward and rearward. As a result, the wood M supported on the pair of wood support rollers 17 can be discharged to the wood transport section 6 after the radioactivity measurement.

  The radiation detection unit 22 of the present embodiment has a box shape, and detects the radiation dose on the surface of the wood M by bringing its lower surface close to or in contact with the surface of the wood M. The number of radiation detection units 22 can be arbitrarily selected as long as it is 1 or more. However, if a plurality of radiation detection units 22 are arranged in the left-right direction, the measurement time can be shortened. Incidentally, in this embodiment, four radiation detection units 22 are arranged in the left-right direction with a predetermined interval (in this embodiment, twice the detection width).

  The detection unit raising / lowering cylinder 24 is, for example, an air cylinder, and raises and lowers the radiation detection unit 22 in accordance with its expansion / contraction operation. In this embodiment, when the radiation detection unit 22 is lowered to perform radioactivity measurement, the radiation detection unit 22 is pressed against the surface of the wood M with the operating pressure of the detection unit elevating cylinder 24. Thereby, the radiation detection unit 22 follows the uneven surface of the wood M, the distance between the radiation detection unit 22 and the surface of the wood M is always kept constant, and the measurement error caused by the variation in the distance Can be suppressed. Although not shown in the present embodiment, a buffer mechanism (an escape mechanism) including an elastic member such as a spring is interposed between the detection unit elevating cylinder 24 and the radiation detection unit 22, and the wood The followability of the radiation detection unit 22 with respect to unevenness and the like existing on the surface of M is improved.

  The balance cylinder 25 suspends the radiation detection unit 22 via the wire 35 wound around the pulley 34 and urges the radiation detection unit 22 in the upward direction. This urging force can be adjusted, and the pressing force of the radiation detector 22 against the wood M can be adjusted based on the urging force adjustment.

  The detection unit sliding motor 27 is provided in the upper frame body 16 and rotates the pinion 27a by being driven. The pinion 27a meshes with a rack 36 provided in the detection unit support frame 23 along the left-right direction, and the rack 36 is fed in the left-right direction in accordance with the drive of the detection unit slide motor 27 so that the detection unit support frame 23 is moved. Slide left and right.

  As shown in FIGS. 8-10, the 1st timber carrying-out part 4 and the 2nd timber carrying-out part 5 are each provided with the strong frame bodies 37 and 38 made from iron. The left and right upper end portions of the frame bodies 37 and 38 are inclined in a front-rear and rear-lower shape, and stoppers 37a and 38a projecting upward are provided at the inclined rear end portions. Thereby, the timber M introduced from the timber transport section 6 to the first timber unloading section 4 or the second timber unloading section 5 is sequentially sent to the rear with the inclination of the frame bodies 37 and 38, and the positions of the stoppers 37a and 38a are the leading positions. Are accommodated in parallel. And the wood M accommodated in the 1st wood carrying-out part 4 or the 2nd wood carrying-out part 5 is carried out using a forklift etc.

  A rotatable gate 39 that opens and closes the wood inlet of the first wood carry-out portion 4 is provided at the upper front end of the first wood carry-out portion 4. The gate 39 opens and closes according to the expansion / contraction operation of the gate opening / closing cylinder 40. The gate 39 is opened when the wood M is introduced into the first wood unloading portion 4, and is otherwise closed.

  The wood transport unit 6 includes an iron-made strong frame 41 extending in the left-right direction, a ladder-shaped conveyor 42 that transports the wood M in the left-right direction, a transport unit transport motor 43 that drives the conveyor 42, and a conveyor The conveyance part wood sensor 44 (refer FIG. 13) which detects the presence or absence of the wood M in the terminal end of 42, and the pusher 45 which extrudes the wood M which reached the terminal end of the conveyor 42 to the back 2nd wood carrying-out part 5 are provided. It is configured.

  The conveyor 42 connects the pair of left and right and front and rear sprockets 46 and 47, the pair of front and rear transport chains 48 wound between the pair of left and right sprockets 46 and 47, and the pair of front and rear transport chains 48 at a predetermined interval. A plurality of connecting members 49 and a guide rail 50 that guides and supports an intermediate portion of the transport chain 48 are configured. The transport unit transport motor 43 rotates the right sprocket 47 via the drive shaft 51. That is, the wood M discharged from the radioactive contamination measuring unit 3 is placed on the connecting member 49 of the conveyor 42 and is conveyed to the right side according to the driving of the conveying unit conveyance motor 43.

  The pusher 45 includes a push plate 52 that is slidably supported back and forth, and a pusher cylinder 53 that moves the push plate 52 back and forth. The push plate 52 is normally positioned on the upper side on the front side of the conveyor 42, and is moved rearward by the pusher cylinder 53 at the timing when the wood M reaches the end of the conveyor 42, and on the conveyor 42 based on the movement. The wood M is pushed out to the rear second wood unloading portion 5.

  Next, the measurement operation of the radioactive contamination measuring unit 3 and the coloring operation for providing a mark will be described with reference to FIGS.

  When measuring the radioactive contamination of the wood M introduced into the radioactive contamination measuring unit 3, as shown in FIG. 11A, the radiation detecting unit 22 is moved to the wood M by the extension operation of the detecting unit raising / lowering cylinder 24. The wood rotating motor 18 is driven to rotate the wood M in the circumferential direction while pressing against the surface. Thereby, it is possible to detect the radiation on the surface of the wood M in a scanning manner and to record the detection data.

  When the wood M rotates once, as shown in FIG. 11B, the rotation of the wood M is stopped, and the radiation detection unit 22 is temporarily raised by the reduction operation of the detection unit elevating cylinder 24. When the radiation detection unit 22 is raised, the radiation detection unit 22 is slid to the right by a predetermined amount based on the drive of the detection unit sliding motor 27 as shown in FIG. This slide amount corresponds to the detection width of the radiation detection unit 22.

  When the slide movement of the radiation detection unit 22 is completed, as shown in FIG. 11D, the rotation of the wood is performed while pressing the radiation detection unit 22 against the surface of the wood M again by the extension operation of the detection unit elevating cylinder 24. The motor 18 is driven to rotate the wood M in the circumferential direction. By repeating such a measurement operation, it is possible to automatically measure radioactive contamination in the entire periphery of the wood M.

  When the detection value of the radiation detector 22 exceeds a predetermined threshold during the radioactive contamination measurement as described above, ink is ejected from the nozzle 30 based on the driving of the coloring pump 29 as shown in FIG. . Thereby, the radioactively contaminated part is marked on the bark portion of the wood M by coloring, and the contaminated part can be visually confirmed.

  Next, the input / output configuration and control procedure of the control unit 7 will be described with reference to FIGS.

  As shown in FIG. 13, on the input side of the control unit 7, the radiation detection unit 22, the carry-in unit wood sensor 11, the measurement unit wood sensor 20, and the transport unit wood sensor 44 are connected. On the output side, the carry-in part transport motor 10, the detection part raising / lowering cylinder 24, the detection part slide motor 27, the wood rotation motor 18, the wood discharge cylinder 19, the coloring pump 29, the transport part transport motor 43, A pusher cylinder 53 and a gate opening / closing cylinder 40 are connected.

  As shown in FIG. 14, the control unit 7 executes automatic radioactivity measurement control. The automatic radioactivity measurement control includes, as subroutines, carry-in unit control (S1), measurement unit control (S2), and conveyance unit control (S3), and these subroutines are repeatedly executed.

  As shown in FIG. 15, in the carry-in unit control, first, it is determined whether or not there is wood M in the wood carry-in unit 2 based on the detection signal of the carry-in unit wood sensor 11 (S11). If this determination result is NO, the process returns to the upper routine as it is, but if the determination result is YES, whether or not there is wood M in the radioactive contamination measurement unit 3 based on the detection signal of the measurement unit wood sensor 20. (S12). If this determination result is NO, the process returns to the upper routine as it is. If the determination result is YES, the wood M in the wood carry-in section 2 is transported by a predetermined amount based on the drive of the carry-in transport motor 10 and is emitted. The wood M is supplied to the performance contamination measuring unit 3 (S13).

  As shown in FIG. 16, in the measurement unit control, it is first determined whether or not the wood M is supplied based on the detection signal of the measurement unit wood sensor 20 (S21). If the determination result is NO, the process returns to the upper routine as it is. If the determination result is YES, the radiation detection unit 22 is lowered to the surface of the wood M by the extension operation of the detection unit elevating cylinder 24 ( S22) The wood rotating motor 18 is driven to rotate the wood M in the circumferential direction (S23). While the wood M is rotating, the detection result of the radiation detection unit 22 is recorded (S24), and it is determined whether or not the detection value of the radiation detection unit 22 exceeds a predetermined threshold (S25). In this case, ink is ejected from the nozzle 30 based on the driving of the coloring pump 29 (S26), and the contaminated portion of the bark of the wood M is colored to give a mark.

  During the rotation of the wood M, it is determined whether or not the wood M has rotated once (S27). If the result of this determination is YES, the rotation of the wood M is stopped (S28), and the detection unit lifting cylinder 24 The radiation detector 22 is once raised by the reduction operation (S29). When the radiation detection unit 22 is raised, the radiation detection unit 22 is slid to the right by a predetermined amount based on the drive of the detection unit slide motor 27 (S30), and it is determined whether or not the slide end is reached (S31). If the determination result is NO, steps S21 to S30 are repeated to measure the entire circumference of the wood M. If the determination result is YES, it is determined that the measurement of the entire circumference of the wood M is completed, and radiation is performed. The performance detection unit 22 is returned to the initial slide position (S32), and the measured wood M is discharged from the radioactive contamination measurement unit 3 onto the conveyor 42 of the wood transport unit 6 based on the extension operation of the wood discharge cylinder 19. (S33).

  As shown in FIG. 17, in the transport unit control, first, it is determined whether or not the radioactive contamination measuring unit 3 performs a wood discharging operation (S41). If the determination result is NO, the process returns to the upper routine as it is. If the determination result is YES, it is determined whether or not the wood M is contaminated wood (S42), and the determination result is YES. In this case, the gate 39 of the first wood unloading section 4 is opened based on the reduction operation of the gate opening / closing cylinder 40 (S43). Thereby, the contaminated wood discharged from the radioactive contamination measuring unit 3 passes through the conveyor 42 of the wood transporting unit 6 and is introduced into the first wood unloading unit 4.

  On the other hand, when the timber M discharged from the radioactive contamination measuring unit 3 is not contaminated timber, the timber M on the conveyor 42 is transported in the right direction based on the driving of the transport unit transport motor 43 (S44). Based on the detection signal of the wood sensor 44, it is determined whether the wood M has reached the end of the conveyor (S45). If the determination result is YES, the conveyor 42 is stopped (S46), and the wood M on the conveyor 42 is pushed out by the pusher 45 to the second second wood unloading section 5 based on the extension operation of the pusher cylinder 53. (S47).

  According to the present embodiment configured as described, the radioactive contamination measuring unit 3 that measures the radioactive contamination of the wood M is provided, and the radioactive contamination measuring unit 3 lays the columnar wood M in a lying state. A plurality of wood support rollers 17 to be supported, a wood rotation motor 18 that rotates the wood M in the circumferential direction based on the rotational drive of the wood support rollers 17, a radiation detection unit 22 that detects radiation, and a radiation detection unit 22 The detection unit elevating cylinder 24 that moves up and down (approaching / separating) with respect to the surface of the wood M and the radiation detection unit 22 are brought close to the surface of the wood M, and the wood M is rotated in the circumferential direction. Because it is equipped with a control unit 7 that automatically measures radioactive contamination on the surface, it is possible to automate the radioactivity measurement of wood M, resulting in a reduction in labor costs compared to manual measurement As much as possible , Also becomes unnecessary measurement's exposure prevention measures. Moreover, since measurement errors due to manual work and variations in measurement results are suppressed, the accuracy of radioactivity measurement can be improved.

  Moreover, the radioactive contamination measuring unit 3 includes a detection unit sliding motor 27 that moves the radiation detection unit 22 in the left-right direction, which is the length direction of the wood M, and the control unit 7 is provided each time the wood M rotates once. Since the radiation detection unit 22 is moved in the length direction of the wood M, the radioactive contamination in the entire circumference of the wood M can be automatically measured.

  Moreover, since the radioactive contamination measuring part 3 is provided with the radiation detection part 22 arrange | positioned along the left-right direction which is the length direction of the timber M, it expands the measurement width | variety in one measurement and shortens measurement time. can do.

  The radioactive contamination measuring unit 3 includes a coloring pump 29 for coloring the surface of the wood M, and the control unit 7 turns on the coloring pump 29 when the detection value of the radiation detecting unit 22 exceeds a predetermined threshold value. Since the contaminated portion of the wood M is colored by operating, the contaminated portion of the wood M can be visually confirmed.

  Moreover, as the radioactive contamination measuring system 1 for wood which measures the radioactive contamination of the timber M, on the surface of the timber M supplied from the timber carrying-in part 2 into which the columnar timber M is carried in, and the timber carrying-in part 2 A radioactive contamination measuring unit 3 that automatically measures radioactive contamination, a plurality of wood carry-out units 4 and 5 from which measured wood M is carried out, and the measured wood M from the radioactive contamination measuring unit 3 to wood Since the wood transporting part 6 is provided with the wood transporting part 6 transporting to the unloading parts 4 and 5, and the wood transporting part 6 distributes the wood unloading parts 4 and 5 serving as the transport destination of the wood M according to the measurement result in the radioactive contamination measuring part 3, A sorting function for automatically distributing the wood M according to the result of radioactivity measurement can be realized.

  In addition, the contaminated wood with the mark on the bark is decontaminated by removing the bark partially including the bark of the mark part in the subsequent processing steps, and may be used as uncontaminated wood. It can be done. The removed bark that has been removed is accumulated or packaged and decontaminated by a separate processing means after dredging. Through these steps, wood and bark can be decontaminated.

  In the present invention, an ink that is colored by ejecting ink is used as the mark means. However, a mark such as marking or taping may be provided so that a contaminated bark portion can be visually recognized. In the case of coloring and marking, there is an advantage that the bark of the contaminated portion is not scattered.

DESCRIPTION OF SYMBOLS 1 ... Radioactive contamination measuring system 2 ... Wood carrying-in part 3 ... Radioactive contamination measuring part 4 ... 1st wood carrying-out part 5 ... 2nd wood carrying-out part 6 ... Wood conveying part 7 ... Control part 17 ... Wood support roller 18 ... wood rotation motor 22 ... radiation detection part 24 ... detection part lifting cylinder 27 ... detection part slide motor 29 ... coloring pump

Claims (9)

A radioactive contamination measuring device for wood that measures radioactive contamination of cylindrical wood,
A plurality of wood support rollers for supporting the wood in a laid state;
Wood rotation means for rotating the wood in the circumferential direction based on the rotation drive of the wood support roller;
A radiation detector for detecting radiation;
Detection unit moving means for always bringing the radiation detection unit close to / separated from the uneven surface of the wood at a constant distance;
Automatic measurement control means for automatically measuring radioactive contamination on the surface of the wood by bringing the radiation detection unit close to the surface of the wood and rotating the wood in a circumferential direction. A radioactive contamination measuring device for wood. A second detector moving means for moving the radiation detector in the length direction of the wood,
The automatic measurement control means automatically measures radioactive contamination in the entire circumference of the wood by moving the radiation detection unit in the length direction of the wood every time the wood rotates once. The radioactive contamination measuring device for wood according to claim 1.   3. The radioactive contamination measuring apparatus for wood according to claim 1, wherein a plurality of the radiation detection units are arranged along a length direction of the wood. The radiation detection unit includes mark means for providing a mark on the surface of the wood,
The said automatic measurement control means operates the said mark means when the detection value of the said radiation detection part exceeds a predetermined threshold value, and provides a mark to the contaminated location of the said wood. The radioactive contamination measuring apparatus for wood as described in any one of these. A radioactive contamination measuring system for wood that measures radioactive contamination of cylindrical wood,
A wood carry-in section into which the wood is carried;
A radioactive contamination measuring unit that automatically measures radioactive contamination on the surface of the wood supplied from the wood carry-in unit;
A plurality of wood unloading parts from which the measured wood is unloaded,
A wood transporting section for transporting the measured wood from the radioactive contamination measuring section to the wood unloading section;
The wood contamination measuring system according to claim 1, wherein the wood transporting unit distributes the wood transporting unit serving as a transport destination of the wood according to a measurement result in the radioactive contamination measuring unit. The radioactive contamination measuring unit is
A plurality of wood support rollers for supporting the wood in a laid state;
Wood rotation means for rotating the wood in the circumferential direction based on the rotation drive of the wood support roller;
A radiation detector for detecting radiation;
Detection unit moving means for always bringing the radiation detection unit close to / separated from the uneven surface of the wood at a constant distance;
Automatic measurement control means for automatically measuring radioactive contamination on the surface of the wood by bringing the radiation detection unit close to the surface of the wood and rotating the wood in a circumferential direction. The radioactive contamination measuring system for wood according to claim 5. The radioactive contamination measuring unit is
A second detector moving means for moving the radiation detector in the length direction of the wood,
The automatic measurement control means automatically measures radioactive contamination in the entire circumference of the wood by moving the radiation detection unit in the length direction of the wood every time the wood rotates once. The radioactive contamination measuring system for wood according to claim 6.   The radioactive contamination measuring system for wood according to claim 6 or 7, wherein a plurality of the radiation detection units are arranged along a length direction of the wood. The radiation detection unit includes mark means for providing a mark on the surface of the wood,
The said automatic measurement control means operates the said mark means when the detection value of the said radiation detection part exceeds a predetermined threshold value, and provides the mark to the contaminated location of the said wood. The radioactive contamination measuring system for wood according to any one of the above.