JP2017191026A - Radiation dose measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiation dosimetry device which offers improved measurement accuracy when making a radiation dose measurement using a multicopter, and is capable of efficiently measuring spatial radiation doses in high places that are difficult for operators to conduct on-site surveys.SOLUTION: A radiation dosimetry device (measurement device 100) of the present invention comprises: a multicopter 110 capable of flying in the air; a sensor 112 fixed to the multicopter and configured to measure radiation doses; a cable 114 that is hanging down straight from the multicopter to keep the multicopter at a predetermined altitude; and a holding tool 122 that is located near the ground surface to hold a lower end of the cable.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a radiation dose measuring apparatus including a multicopter that can move by flying in the air.

  As an index for judging the degree and distribution of radioactive contamination on the ground surface, there is a radiation dose rate on the ground surface (hereinafter referred to as a ground surface dose rate). To measure the dose rate on the ground surface, a survey meter called a collimator with a lead cover with a thickness of 10 mm or more is used to measure at an interval (for example, an interval of 5 m) according to the required distribution accuracy. ing. However, since the collimator is heavy and must be measured while repeatedly moving and stably installed at every measurement interval, the work efficiency is low. Therefore, in the above method, if the measurement interval is shortened (narrowed) in order to improve the accuracy of the distribution of radiation contamination, the working time becomes very long.

  Although not strictly the dose rate on the ground surface, a radiation measuring device with excellent portability as shown in Non-Patent Document 1 has been developed as a measuring device capable of measuring the air dose rate near the ground surface. The radiation measuring instrument of Non-Patent Document 1 is a stick-shaped radiation measuring instrument in which two radiation detection units (plastic scintillator devices) are arranged at arbitrary intervals (for example, positions of 5 cm and 100 cm on the ground surface) in the height direction. The height of the two radiation detection units is set in consideration of the difference in height between adults and children. As a result, when the worker walks while holding the radiation measuring instrument, the radiation doses at two heights can be measured simultaneously, so that the working efficiency can be improved and the working time can be greatly shortened.

Radiation dose measurement demonstration using γ plotter (gamma plotter) H, [online], [October 4, 2012 search], Internet <URL: http://www.jaea.go.jp/fukushima/ other / 2012-082902.pdf>

  In recent years, construction of buildings on land where decontamination work has been completed is planned. In this case, it is necessary to predict that the additional radiation dose, excluding natural radiation, will be 1 mSv or less per year based on the law regarding the radiation dose received annually by those who work or live there after completion of the building. At this time, if the building is a single-story building, measure the radiation dose of the building construction planned site with the radiation measuring instrument as in Non-Patent Document 1 described above, and after the building is completed from the radiation dose of the space there It is considered possible to estimate the individual dose of work and living individuals.

  However, when the building is a two-story or three-story building, the space for work and living after completion of the building extends considerably above the ground surface. In that case, if it is a radiation measuring instrument such as Non-Patent Document 1, it is necessary to lengthen the stick-like member to which the radiation detector is attached to the extent that it reaches the height of the second floor or the third floor, In practice, it is extremely difficult for a worker to hold such a long bar while conducting a field survey.

  Therefore, as a method for measuring the radiation dose at a high place, it has been studied to use a multicopter (also called a drone) that can move by flying in the air. In this case, a sensor for measuring the radiation dose is mounted on the multicopter. Then, the multicopter is made to fly to the measurement area, and when it arrives, the radiation dose is measured. At this time, the multicopter measures the radiation dose while flying (while hovering) so that the sensor is positioned at the measurement height at the measurement location.

  However, although the multicopter has a relatively high horizontal position accuracy, the vertical position accuracy is low. That is, it is difficult to continue (or stay) accurately while receiving a disturbance of a natural environment such as a crosswind at a predetermined height in the vertical direction. For this reason, in the radiation measurement which should be measured by predetermined height, there exists a problem that the precision (reliability) of data will fall.

  In view of such problems, the present invention can improve the measurement accuracy when measuring the radiation dose using a multicopter, and can reduce the radiation dose in a high place where it is difficult for an operator to conduct a field survey. It aims at providing the radiation dose measuring apparatus which can be measured efficiently.

  In order to solve the above problems, a representative configuration of a radiation dose measuring apparatus according to the present invention includes a multicopter that can fly in the air, a sensor that is fixed to the multicopter and measures a radiation dose, and is suspended from the multicopter. The cable includes a cable that defines the multicopter at a predetermined height, and a holder that holds the lower end of the cable near the ground surface.

  According to the above configuration, the position of the multicopter can be regulated to a predetermined height by the cable. Thereby, it becomes possible to arrange the multicopter accurately, quickly and easily at a predetermined height, and the measurement accuracy when measuring the radiation dose using the multicopter can be improved. Therefore, it becomes possible to efficiently measure the radiation dose in a high place where it is difficult for a worker to conduct a field survey.

  The holder may be capable of winding and unwinding the cable. Thereby, it becomes possible to adjust the predetermined height of a multicopter by adjusting the length of a cable with a holder.

  The cable may be marked with a height indicating the height of the multicopter from the ground surface. Thereby, a multicopter can be easily arrange | positioned to predetermined height.

  The radiation dose measuring device may further include a crawler capable of traveling on the ground surface, and the holder may be fixed to the crawler. Thereby, a multicopter can be moved to a measurement location by moving a crawler.

  It is preferable to further include an impact absorbing member that is disposed at an attachment location of the multicopter and the cable and absorbs an impact. Thereby, it is possible to absorb impact and vibration in the impact absorbing member, and it is possible to prevent damage to the multicopter and consequently the measuring apparatus.

  It is preferable that power can be supplied to the multicopter via the cable. Thereby, since electric power can be continuously supplied to the multicopter, it becomes possible to perform measurement for a long time.

  ADVANTAGE OF THE INVENTION According to this invention, the measurement precision at the time of measuring a radiation dose using a multicopter can be improved, and the radiation dose of the high space where it is difficult for a worker to perform a field survey is efficiently measured. It is possible to provide a radiation dose measuring apparatus that can

It is a figure explaining the radiation dose measuring apparatus concerning this embodiment. It is a figure explaining the measuring method of the radiation dose using the measuring apparatus of this embodiment. It is detail drawing of the measuring apparatus of FIG.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is a diagram illustrating a radiation dose measuring apparatus (hereinafter referred to as a measuring apparatus 100) according to the present embodiment. As shown in FIG. 1, the measuring apparatus 100 of this embodiment is comprised including the multicopter 110 which can fly in the air, and the crawler 120 which can drive | work a ground surface.

  A sensor 112 for measuring the radiation dose is fixed to the multicopter 110. In this embodiment, the support | pillar 112a is attached to the upper part of the multicopter 110, and the sensor 112 is being fixed via this support | pillar 112a. In addition, this structure is only an illustration and is not limited to this. For example, the sensor 112 may be directly fixed to the upper part or the lower part of the main body of the multicopter 110, or a support may be provided at the lower part of the multicopter 110 and fixed thereto.

  A cable 114 that defines the multicopter 110 to a predetermined height H is suspended from the multicopter 110. In the present embodiment, the lower end of the cable 114 is held by a holder 122 fixed to a crawler 120 described later. Further, landing legs 116 a and 116 b are attached to the lower part of the multicopter 110. Thereby, the multicopter 110 can be landed stably.

  A holder 122 that holds the lower end of the cable 114 near the ground surface is fixed to the crawler 120. In the present embodiment, the holding tool 122 has a reel mechanism and can wind and unwind the cable 114. Thereby, the length of the cable 114 can be adjusted, and the predetermined height H of the multicopter 110 can be adjusted.

  FIG. 2 is a diagram for explaining a radiation dose measurement method using the measurement apparatus 100 of the present embodiment. When measuring the radiation dose at a high place using the measuring apparatus 100 of this embodiment, as shown in FIG. 2A, first, the multicopter 110 is loaded on the crawler 120 and moved to the measurement location. Then, after moving to the measurement location, as shown in FIG. 2 (b), the cable 114 is fed out by the holder 122, the multicopter 110 is caused to fly, and the sensor 112 is arranged at a predetermined height H (see FIG. 1). Start measuring radiation dose.

  Thereafter, when measuring radiation doses at different heights at the same measurement location, the radiation dose in a higher space can be measured by further extending the cable 114. On the contrary, if the cable 114 is wound up by the holder 122, the radiation dose at a position lower than the predetermined height H can be measured.

  As described above, according to the measuring apparatus 100 of the present embodiment, the length of the cable 114 suspended from the multicopter 110 is adjusted by the holder 122, whereby the predetermined height of the multicopter 110 is adjusted by the cable 114. H can be defined. Therefore, the multicopter 110 can be accurately and quickly arranged at a predetermined height. Thereby, it is possible to improve the measurement accuracy when measuring the radiation dose using the multicopter 110, and to efficiently measure the radiation dose in a high place where it is difficult for an operator to conduct a field survey. It becomes possible.

  Further, as shown in FIG. 1, the cable 114 may be provided with a marking 118 indicating the height of the multicopter 110 from the ground surface. Thereby, the multicopter 110 can be more accurately and efficiently arranged at a predetermined height, and the height of the multicopter 110 can be grasped.

  3 is a detailed view of the measuring apparatus 100 of FIG. 1, FIG. 3 (a) is a detailed view of the multicopter 110, and FIG. 3 (b) is a schematic cross-sectional view of the cable 114. As shown in FIG. 3A, in the present embodiment, a spring 130 as an impact absorbing member is disposed on an attachment plate 114 a that is an attachment location of the cable 114 to the multicopter 110.

  When the crawler 120 is moved while the multicopter 110 is flying, the cable 114 is taken up and fed out by the holding tool 122, or a gust of wind blows, shocking vibration, tension, or loosening of the cable 114 occurs. Will occur. Then, the multicopter 110 cannot respond to the momentary tension change, and the posture becomes unstable, or the control to maintain the posture has caused excessive movements such as a sudden rise and a sudden drop, and it is unstable. There is a risk of becoming. However, the shock and vibration are absorbed by the spring 130, so that the flight of the multicopter 110 can be stabilized and the damage to the measuring apparatus 100 can be prevented.

  In the present embodiment, the spring 130 is exemplified as the shock absorbing member. However, the present invention is not limited to this, and other members may be used. For example, the multicopter 110 and the cable 114 may be configured to be connected by a magnet. As a result, the connection is disconnected when an impact tensile stress is applied, so that the multicopter 110 can be prevented from falling.

  Moreover, in this embodiment, as shown in FIG.3 (b), the electric wire 146 is arrange | positioned between the coating | covering material 142 of the cable 114, and the wire 144. FIG. The electric wire 146 is connected to the battery 124 mounted on the crawler 120 as shown in FIG. Thereby, in the measuring apparatus 100 of the present embodiment, power can be supplied from the battery 124 to the multicopter 110 via the cable 114.

  As described above, since power can be supplied to the multicopter 110, it is possible to perform measurement for a longer time. In addition, since the battery (not shown) of the multicopter 110 can be reduced in size or not required, the weight of the multicopter 110 can be reduced.

  In addition, although the structure which fixes the holder 122 to the crawler 120 was illustrated in this embodiment, it is not limited to this. For example, when the crawler 120 is not provided, the multi-copter 110 is fixed in the same manner as described above by fixing the holder 122 to the ground surface with an anchor or a weight, or by attaching a pedal and an operator steps on the foot. It is possible to obtain the effect of defining the height of the.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  INDUSTRIAL APPLICABILITY The present invention can be used as a radiation dose measuring device including a multicopter that can move by flying in the air.

DESCRIPTION OF SYMBOLS 100 ... Measuring apparatus, 110 ... Multicopter, 112 ... Sensor, 112a ... Strut, 114 ... Cable, 114a ... Mounting plate, 116a ... Landing leg, 116b ... Landing leg, 118 ... Marking, 120 ... Crawler, 122 ... retainer, 124 ... battery, 130 ... spring, 142 ... covering material, 144 ... wire, 146 ... electric wire

Claims (6)

A multicopter capable of flying in the air,
A sensor fixed to the multicopter for measuring radiation dose;
A cable hanging from the multicopter and defining the multicopter to a predetermined height;
A holder for holding the lower end of the cable near the ground surface;
A radiation dose measuring device comprising:   The radiation dose measuring apparatus according to claim 1, wherein the holder is capable of winding and unwinding the cable.   The radiation dose measuring device according to claim 1 or 2, wherein the cable is marked with a height indicating the height of the multicopter from the ground surface. It is further equipped with a crawler that can run on the ground surface,
4. The radiation dose measuring apparatus according to claim 1, wherein the holder is fixed to the crawler. 5.   The radiation dose measuring apparatus according to any one of claims 1 to 4, further comprising an impact absorbing member that is disposed at an attachment location of the multicopter and the cable and absorbs an impact.   The radiation dose measuring apparatus according to any one of claims 1 to 5, wherein the multicopter can be supplied with power via the cable.

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