JP2007333463A - Radiation measuring apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To acquire a radiation measuring apparatus capable of reducing the labor required for measurements, and of shortening the measuring time. <P>SOLUTION: In the radiation measuring apparatus, a pipe 31 is inserted in a pipe 21 of a mobile base 20 supported at wheels 26 to fix the pipe 31 with screws (not shown). A driving device 5 drives via a wire 9, detector-supporting plates 41 and 42 each of which is mounted with four radiation detectors 1, 2 in a row in a side and above a height-adjustable supporting frame 30 for measuring the radiation distributions of a wall surface 91 and a ceiling 92. Since the driving device 5 drives the detector-supporting plates 41 and 42 is mounted with a plurality of the radiation detectors 1, 2 to measure radiation, the labor required for measurements can be reduced and the measuring time can be shortened. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a radiation measuring apparatus that detects radiation on, for example, a wall surface or a ceiling.

  As a conventional radiation measuring device, a driving base is provided and a traveling base, a lifting mechanism provided on the base, and a radiation detecting device connected to a wire of the lifting mechanism, a floor or ceiling or There is one that performs radiation measurement while moving the γ-ray detector of the radiation detection apparatus along the wall surface (see, for example, Patent Document 1).

JP-A-2-259588 (page 2, upper right column, line 12 to lower left column, line 13 and FIG. 1)

  In the conventional radiation measuring apparatus as described above, the object to be measured is γ-ray, and a shield is required around the γ-ray detector. Therefore, the γ-ray detector cannot be made very large, and a small γ-ray detector is used. It takes a lot of time to measure a large area with good positional resolution. The present invention has been made to solve such problems, and an object of the present invention is to obtain a radiation measuring apparatus that can reduce the measurement effort and the measurement time.

  The radiation measuring apparatus according to the present invention includes a moving carriage, a supporting member supported so as to be able to adjust a distance from a predetermined position of the moving carriage, a radiation detector supported by the supporting member via the moving member, and a moving carriage. A moving member driving device that is mounted and drives the moving member in a predetermined direction is provided.

  As described above, the radiation measuring apparatus according to the present invention includes a moving carriage, a supporting member supported by the moving carriage via an expansion / contraction support device, a moving member provided on the supporting member, and a radiation fixed to the moving member. Since the radiation detector to be measured and the moving member driving device that is mounted on the moving carriage and drives the moving member in a predetermined direction are provided, the measurement effort can be reduced and the measurement time can be shortened.

Embodiment 1 FIG.
1 to 4 show a first embodiment for carrying out the present invention. FIG. 1 is a configuration diagram showing a configuration of a radiation measurement apparatus, and FIG. 2 is an installation diagram showing an installation example of the radiation measurement apparatus. FIG. 3 is a flowchart showing a measurement procedure, and FIG. 4 is an explanatory diagram showing a display example of a measurement result. In FIG. 1, the radiation measuring apparatus is configured as follows. A support frame 30 is supported on the base 20 so as to be vertically movable. The base 20 connects two L-shaped pipes 21 in the horizontal direction of FIG. 1 with pipes 22, forms a rectangular frame 23 with the pipes 21 and 22, and mounts a mounting plate 24 on the rectangular frame 23. Four wheels 26 are attached to the bottom, and two stoppers 25 are fixed to the left. The base 20 that is supported by the four wheels 26 so as to be movable is the movable carriage in the present invention.

  In the support frame 30, two other L-shaped pipes 31 having a diameter smaller than that of the pipe 21 are similarly connected by a connection pipe 32, and the connected horizontal portion is used as an upper horizontal portion 34 as a support member. 1, two stoppers 35 are fixed to the left side, and four stoppers 36 are fixed to the upper part. The end portion 31a of the pipe 31 is inserted into the end portion 21a of the L-shaped pipe 21, the end portions 21a and 31a of the pipe are configured to be inserted, and the end portion 31a of the inner pipe 31 is slid to expand and contract. After that, a screw (not shown) is screwed into a screw hole (not shown) provided at the end 21a of the outer pipe 21, and the inner pipe 31 can be fixed at a predetermined position by tightening the screw. A pulley 37 is attached to the center of the pipe 32. The end 21a of the outer pipe 21, the end 31a of the pipe 31 inserted into the end 21a, and a screw (not shown) are the telescopic support device in the present invention. Moreover, the end part 31a of the pipe 31 is a cross direction support member in this invention.

  A detector support plate 41 as a cross direction moving member and a detector support plate 42 as a moving member are attached to the support frame 30 so as to be movable in the vertical direction and the horizontal direction, respectively. In the left-right direction, that is, the direction perpendicular to the direction of movement of the detector support plate 41, four radiation detectors 1 as cross-direction radiation detectors are fixed in a row, and the detector support plate 42 has left and right in FIG. Four radiation detectors 2 are fixed in a row in the direction, that is, in the direction perpendicular to the moving direction of the detector support plate 42. The radiation detectors 1 and 2 detect β rays. In addition, the radiation measuring instrument 4, the driving device 5, the signal processing device 6, and the operation display device 11 are placed on the mounting plate 24 of the base 20, and the radiation detector 1 and the radiation measuring device 4 described above detect the detector signal. They are connected by a cable 61.

  The detector support plates 41 and 42 are connected by a wire 9 via a pulley 37 and are driven by the wire 9 in the up-down direction and the horizontal direction by a cross-direction moving member driving device and a driving device 5 as a moving material driving device, respectively. The The radiation measuring device 4 obtains a radiation distribution from the radiation detected by the radiation detector 1. The signal processing device 6 receives the position information of the radiation detector 1 from the driving device 5 and the radiation information from the radiation measuring device 4, and obtains the radiation density corresponding to the position by arithmetic processing. The operation display device 11 displays the calculation result of the signal processing device 6.

  Next, the installation procedure of the radiation measuring apparatus will be described using the installation example of FIG. The apparatus is moved to the measurement point by the wheel 26 and the apparatus is installed so that the stoppers 25 and 35 on the wall surface 91 side come into contact with the wall surface 91. Next, the pipe 31 is moved upward and installed so that the stopper 36 on the ceiling 92 side contacts the ceiling 92, and the end portion 31 a of the pipe 31 is fixed to the end portion 21 a of the pipe 21 with a screw. When the pipe 31 is moved up and down, the length of the wire 9 becomes excessive and insufficient, so that the wire is drawn and wound by the driving device 5.

  The stoppers 25 and 35 on the wall surface 91 side and the stopper 36 on the ceiling 92 side are adjusted so that the distance between the radiation detector 1 and the wall surface 91 or the ceiling 92 is constant, and is detected when surface contamination is detected. Sensitivity can be easily made constant. When measuring the radiation of the wall surface 91, it is measured by the radiation detector 1 installed at a position corresponding to the wall surface 91, and when measuring the radiation of the ceiling 92, it is installed at a position corresponding to the ceiling 92. Measurement is performed by the radiation detector 2.

  Next, the measurement procedure will be described with reference to the flowchart of FIG. When a measurement start signal is input from the operation display unit 11 (step S11), a movement signal is sent from the arithmetic processing unit 6 to the drive unit 5, and the detector support plate 2 moves to the initial position, whereby the radiation detector 1 starts the measurement. Positioned at the position (step S12), measurement of surface radiation, that is, radiation contamination is started (step S13). After the measurement is completed, the measured value is processed and the measurement result is displayed on the screen (step S14). Next, the detector support plates 41 and 42 are automatically moved to the next measurement position using the driving device 5 in accordance with a movement command from the arithmetic processing unit 6 (step S15), and the radiation detectors 1 and 2 are finished measuring. It is determined whether or not it is at a position, that is, whether or not the measurement up to a predetermined position has been completed (step S16). If it has been moved to the measurement end position in step S16, the measurement is ended (step S17). Thereafter, the radiation measuring apparatus is moved to the next measurement location.

  Next, display of measurement results will be described with reference to FIG. FIG. 4 shows measured values of radiation when measuring radiation in the range of 300 cm in height of the wall surface 91 and 0 to 200 cm in the position of the ceiling 92 with this apparatus in which four 50 cm × 50 cm size detectors are arranged. Is a display example. The wall surface 91 is sequentially measured from the bottom to the top, and the measurement results at each position are combined with the position information of the detector support plates 41 and 42 obtained from the driving device 5 as the moving member position information transmitting device, as shown in FIG. Display sequentially as in a). When the set threshold values are exceeded, colors corresponding to the respective threshold values (indicated by hatching in FIG. 4) are attached. In addition, a message indicating that measurement is in progress is displayed for the position currently being measured. Similarly, for the ceiling 92, as shown in FIG. 4B, radiation measurement values are displayed corresponding to the positions.

  With this radiation measuring apparatus, it becomes possible to automatically measure the distribution of the surface contamination density by combining the position information of the radiation detector 1 transmitted to the signal processing unit 6 and the measured value of the radiation as the surface contamination density information. Can reduce the labor required. Further, as the radiation detectors 1 and 2, by measuring a plurality of large-area β-ray surface contamination detectors side by side, for example, a wide area can be measured in a short time. Needless to say, the position resolution, measurement time, and accuracy can be adjusted by changing the size, number of radiation detectors 1 and 2, the pitch of the measurement positions, and the measurement time at each measurement position.

Embodiment 2. FIG.
FIG. 5 is a main part configuration diagram showing the main part of the radiation measuring apparatus according to the second embodiment of the present invention. As shown in FIG. 5, by providing a γ-ray shield 73 between the detector support plate 2 and the radiation detector 1, a radiation detector that detects β-rays by reducing noise due to external γ-ray radiation. 1 high sensitivity can be achieved. The radiation detector 1 and the γ-ray shield 73 constitute a radiation detection device.

Embodiment 3 FIG.
6 and 7 show the third embodiment of the present invention, FIG. 6 is a configuration and installation diagram showing the configuration and installation of the radiation measuring apparatus, and FIG. 7 is a flowchart showing the measurement procedure. In the first embodiment, the base 20 is moved manually. However, as shown in FIG. 6, the base 20 has a traveling motor 44, a moving distance measuring device 45 as a moving cart position information transmitting device, In addition, by attaching the proximity sensor 46 and controlling it by the signal processor 56, automatic movement measurement can be performed.

  Next, the measurement procedure will be described with reference to the flowchart of FIG. In FIG. 7, the radiation measuring apparatus is installed at the initial position, and the moving direction is set to a two-dimensional (X, Y) direction (step S21). When the moving direction is the X direction in step S22, the ceiling 92 is measured (step S23), and after the measurement is completed, the measuring range (one step) is moved in the X direction (step S24). At that time, it is monitored whether or not the proximity sensor 46 is operating, that is, whether or not the distance from the wall surface 91 is not less than a predetermined value by the proximity sensor 46 (step S25). In step S25, if the proximity sensor 46 does not operate while the distance from the wall surface 91 is greater than or equal to the predetermined value and moves, the process returns to step S23 and the next measurement is started.

  If the proximity sensor 46 is activated in step S25, the movement is stopped (step S26), and measurement is performed (step S27). Thereby, the measurement for the line of the X direction of a room is possible. It is determined whether or not all the measurements in the X direction and the Y direction are finished and are at the end position (step S28). If not finished, the process returns to step S22, and the measurement is sequentially performed by shifting the frame width in the Y direction (step S31). ~ S35). In step S28, if both the X direction and the Y direction are at the end positions, the measurement ends. The measured values are measured for the surface contamination of the entire ceiling based on the position information of the radiation detector 1 from the driving device 5 as the moving distance measuring device 45 and the moving member position information transmitting device as the moving cart position information transmitting device. (Measurement of radiation) becomes possible. The wall 91 can be similarly measured for radiation.

  As described above, the driving device 44 drives the base 20 in the X direction and the Y direction by the traveling motor 44, the moving distance information from the moving distance measuring device 45, the position information of the radiation detector 1 from the driving device 5, and the radiation. Based on the measurement value of the radiation on the measurement target surface measured by the detector 1 or the radiation detector 2, the distribution state of radiation contamination on the measurement target surface can be quickly and easily known.

  As described above, the radiation measuring apparatus according to the present invention includes a moving carriage, a supporting member supported by the moving carriage via an expansion / contraction support device, a moving member provided on the supporting member, and a radiation fixed to the moving member. Since the radiation detector to be measured and the moving member driving device that is mounted on the moving carriage and drives the moving member in a predetermined direction are provided, the measurement effort can be reduced and the measurement time can be shortened.

  And a cross direction support member provided in a direction crossing the support member, a cross direction movement member provided in the cross direction support member, a cross direction radiation detector fixed to the cross direction movement member and measuring radiation, Since both the radiation detector and the cross-direction radiation detector are equipped with a cross-direction movement member driving device that is mounted on the movable carriage and drives the cross-direction movement member in a direction crossing the support member. The radiation can be measured by this, and the measurement effort can be reduced and the measurement time can be shortened.

  Further, since the radiation detectors are arranged in a direction intersecting with the predetermined direction, the radiation detectors simultaneously emit radiation of a predetermined width in the direction intersecting the predetermined direction by the plurality of radiation detectors. Since measurement is possible, measurement time can be shortened.

  The radiation detector is for detecting β-rays, and the support member is provided with a γ-ray shield for shielding γ-rays incident on the radiation detector. Noise can be reduced, and the sensitivity of the radiation detector that detects β rays can be increased.

  And a mobile carriage driving device that drives the mobile carriage, a mobile cart position information transmission device that transmits position information of the mobile cart, a moving member position information transmission device that transmits position information of the moving member, and a radiation detector. Since the radiation distribution display device that displays the detected radiation corresponding to the position information of the moving carriage and the moving member is provided, the radiation value corresponding to the position can be easily known. be able to.

It is a block diagram which shows the structure of the radiation measuring device which is Embodiment 1 of this invention. It is an installation figure which shows the example of installation of a radiation measuring device. It is a flowchart which shows a measurement procedure. It is explanatory drawing which shows the example of a display of a measurement result. It is a principal part block diagram which shows the principal part of the radiation measuring device which is Embodiment 2 of this invention. It is the structure and installation figure which show the structure and installation of the radiation measuring device which is Embodiment 3 of this invention. It is a flowchart which shows a measurement procedure.

Explanation of symbols

1, 2 radiation detector, 4 radiation measuring device, 5 driving device, 6 signal processing device,
11 operation display device, 12 wheels, 20 base, 21a end of pipe, 30 support frame,
31a pipe end, 41, 42 detector support plate, 44 travel motor,
45 moving distance measuring device, 46 proximity sensor, 73 gamma ray shield.

Claims (5)

A moving carriage, a supporting member supported by the moving carriage via an expansion / contraction support device, a moving member provided on the supporting member, a radiation detector fixed to the moving member and measuring radiation, and the moving carriage A radiation measurement apparatus comprising: a moving member driving device that is mounted and drives the moving member in a predetermined direction. A cross direction support member provided in a direction crossing the support member; a cross direction movement member provided on the cross direction support member; a cross direction radiation detector fixed to the cross direction movement member and measuring radiation; The radiation measuring apparatus according to claim 1, further comprising a cross direction moving member driving device mounted on the movable carriage and driving the cross direction moving member in a direction crossing the support member. The radiation measuring apparatus according to claim 1, wherein a plurality of the radiation detectors are arranged in a direction intersecting the predetermined direction. 2. The radiation detector according to claim 1, wherein the radiation detector detects β-rays, and the support member is provided with a γ-ray shield for shielding γ-rays incident on the radiation detector. Radiation measurement equipment. A mobile cart drive device for driving the mobile cart, a mobile cart location information transmitter for transmitting location information of the mobile cart, a mobile member location information transmitter for transmitting location information of the mobile member, and the radiation detector The radiation measurement apparatus according to claim 1, further comprising a radiation distribution display device that displays the radiation detected in step 1 in correspondence with position information of the movable carriage and the movable member.

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