JP2007271502A - Monitor for article carrying-out - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a monitor for article carrying-out capable of measuring radioactive contamination of entire surface including upper and bottom faces and side faces of article with good sensitivity. <P>SOLUTION: This monitor comprises measuring devices 1, 2 for measuring longitudinal and lateral dimensions and height of the article 3 carried out from a radioactivity control area, upper face detectors 5a, 5b, a bottom face detector 6, a left face detector 5a and a right face detector 5b which are installed on upper, lower and side parts of the article 3 for measuring radioactive contamination of the article 3, drive devices 8, 9 for moving or rotating at least one of the detectors 5a, 5b, a control part 22 for controlling the drive devices 8, 9 based on the measured values by the measuring devices 1, 2 to adjust the distance between each detector 5a, 5b and the article 3, and an operation/display part 23 for inputting conditions for contamination measurements and displaying the measured values. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an article delivery monitor for measuring radioactive contamination of an article when a relatively small article used in the radiation management area is carried out of the radiation management area.

  In facilities that handle radioactive materials, when carrying out various items used in the radioactivity management area outside the management area, an article carry-out monitor is used to confirm that the radioactive material is not attached to the surface of the carry-out article. (See Patent Documents 1 and 2). Since August 2005, the Ministry of Economy, Trade and Industry issued a guideline (Non-Patent Document 1) for taking out items from the radiation control area, and the contamination control of the items taken out from the radiation control area has been strengthened. Monitors are required to ensure detection sensitivity that is higher than conventional ones. However, in the conventional article removal monitor, the height of the article is detected to change the height of the upper detector or the lower detector, the measurement distance between the upper surface of the article and the detector is controlled to be constant, and the radiation on the upper surface of the article is controlled. The detection sensitivity of the density is ensured, but the side surface of the article has a fixed side detector, so that the detection distance becomes large for a small article, causing a reduction in sensitivity.

Even in the inventions disclosed in Patent Documents 1 and 2, the height direction of the article is detected and a detector is brought close to the article to obtain a predetermined detection sensitivity, but this is necessary to ensure the side detection sensitivity. Does not have a configuration or processing method.
JP-A-4-309886 Japanese Patent Laid-Open No. 7-053015 Guidelines on how to identify non-radioactive waste generated from nuclear power plants (July 19, 2005, Ministry of Economy, Trade and Industry, Harain No. 3)

  An object of the present invention is to provide an article carry-out monitor capable of measuring radioactive contamination on all surfaces including the upper and lower surfaces and side surfaces of an article with good sensitivity.

  In order to solve the above problems, the present invention provides a measuring device for measuring the vertical and horizontal dimensions and height of an article carried out from a radioactivity management area, and the radioactivity of the article provided at the upper, lower and side portions of the article. An upper surface detector, a lower surface detector, a left surface detector, and a right surface detector that perform contamination measurement, a drive device that moves or rotates at least one of the detectors, and the drive device based on a measurement value by the measurement device A control unit that controls and adjusts the distance between each detector and the article, and an operation / display unit that inputs a contamination measurement condition and displays a measurement value are provided.

  According to the present invention, radioactive contamination of all surfaces including the upper and lower surfaces and side surfaces of an article can be measured with good sensitivity.

The article carry-out monitor according to the first and second embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
First, the first embodiment will be described with reference to FIGS.
As shown in FIGS. 1, 2, and 3, the article carry-out monitor according to the present embodiment includes a conveyor 4 that is provided in the casing 30 and carries the article 3 carried out from the radiation management area on the tray 7, and the article. 3, a dimension measuring device 1 for measuring the length and width in a horizontal plane, a height measuring device 2 for measuring the height of the article 3, and an upper surface / side detector for detecting the radioactivity on the upper surface and the side surface of the article 3 5a, 5b, a lower surface detector 6 for detecting radioactivity on the lower surface of the article 3, an upper surface / side surface detector vertical drive motor 8 for moving the upper surface / side surface detectors 5a, 5b in the vertical direction, and an upper surface / side surface detection Using the measured values of the upper surface / side surface detector rotation driving motor 9 for rotating the devices 5a and 5b, the dimension measuring device 1 and the height measuring device 2, the conveyor 4, the upper surface / side surface detector vertical driving motor 8, and the upper surface / side surface. A control unit 22 for controlling the detector rotation drive motor 9; A data processing unit 24 that inputs the radioactivity detection values by the side surface detectors 5a and 5b and the bottom surface detector 6 to calculate whether the article 3 can be taken out, and a drive command for the conveyor 4 and the like are input to the control unit 22 The operation / display unit 23 displays the radioactivity detection values by the upper surface / side surface detectors 5a and 5b and the lower surface detector 6 and whether or not the article can be taken out.

  As shown in FIG. 3, the article carry-out monitor according to the present embodiment includes a set of L-shaped detectors 5 a and 5 b in which two detectors on the side surface and the upper surface are built in one detector. The radioactivity is detected by adjusting the distance from the article 3 by moving up and down and left and right according to the width.

  When the article 3 is placed on the tray 7, the vertical and horizontal dimensions are measured by the dimension measuring apparatus 1 and the height dimension is measured by the height measuring apparatus 2, and then the conveyor 4 is driven and conveyed to the measuring position. When the article 3 is set at the measurement position, the upper surface / side surface detector vertical drive motor 8 lowers the upper surface / side surface detector 5a and stops at a predetermined position. At the same time, the upper surface / side surface detectors 5a and 5b move close to the left and right side surfaces of the article 3 based on the dimension data, and stop at a predetermined position. In this state, the radioactive contamination of the upper and lower surfaces and the left and right surfaces of the article 3 is measured. Thereafter, the upper surface / side surface detectors 5a and 5b are returned to their original positions in the lateral direction, rotated 90 degrees by the action of the upper surface / side surface detector rotation drive motor 9, and moved close to the front and rear surfaces of the article 3 to a predetermined position. Stop and measure the front and back contamination.

  FIG. 4 shows a modification of the present embodiment, in which two L-shaped detectors are not provided, but one L-shaped top / side detector 5c and one side detector 5d are provided. is there. In this modified example, the article 3 is set in advance by the measurer near the upper surface / side surface detector 5c and is carried in. Thereafter, when the measurement position is reached, the upper surface / side surface detector 5c is lowered, and at the same time, the side surface detector 5d is moved leftward and stopped at a predetermined position. In this state, the radioactive contamination of the upper and lower surfaces and the left and right surfaces of the article 3 is measured. Then, it rotates 90 degrees and measures the front and back surfaces.

  According to the present embodiment, the detectors 5a, 5b, 5c, and 5d are positioned at an ideal distance from the article 3, and the radioactive contamination of all surfaces including the upper and lower surfaces and the side surfaces of the article 3 with good sensitivity. Can be measured. In addition, when the horizontal width of the tray 7 is configured to be extendable, there is an advantage that the upper surface / side surface detectors 5a, 5b, 5c and the side surface detector can be easily moved.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS.
As shown in FIGS. 5 and 6, the article carry-out monitor according to the present embodiment includes a conveyor 4 that is provided in the casing 30 and carries the article 3 carried out from the radiation management area on the tray 7, and the article 3. A dimension measuring device 1 for measuring vertical and horizontal dimensions in a horizontal plane, a height measuring device 2 for measuring the height of the article 3, a measurement box 15 defined in the housing 30, and the upper and lower surfaces of the article 3 The upper surface detector 5 and the lower surface detector 6 for measuring the radioactivity of the left side detector 11, the right surface detector 12, the front detector 13 and the front surface detector 13 for detecting the radioactivity of the left side surface, the right side surface, the front surface and the rear surface of the article 3. According to the measured values of the rear surface detector 14, the dimension measuring device 1 and the height measuring device 2, the upper surface detector 5, the lower surface detector 6, the left surface detector 11, the right surface detector 12, the front surface detector 13 and the rear surface detector 14 Control unit 22 that moves and adjusts position, and upper surface detector A data processing unit 24 for processing the measurement data of the lower surface detector 6, the left surface detector 11, the right surface detector 12, the front surface detector 13 and the rear surface detector 14 to calculate the surface contamination density of the article 3 and whether or not it can be taken out. The operation / display unit 23 is configured to input measurement conditions and the like to the control unit 22 and the data processing unit 24 and to display the surface contamination density of the article 3 and whether or not it can be taken out.

  FIG. 7 shows the initial positions of the detectors 11, 12, 13, and 14 before the article measurement and the movement at the time of measurement in the first example of the present embodiment, and the article 3 is on the lower surface detector 6. On the tray 7.

  First, the left surface detector 11 and the right surface detector 12 move, approach the article 3 and stop at a predetermined distance, and radioactive contamination measurement is performed on the left and right surfaces of the article. Next, after the left surface detector 11 and the right surface detector 12 are returned to their original positions, the upper surface detector 5 descends and stops at a predetermined distance, and the upper surface detector 5 and the lower surface detector 6 Conduct radioactive contamination measurements on upper and lower surfaces. Finally, after the upper surface detector 5 is returned to the original position, the front detector 13 and the rear detector 14 move, approach the article 3 and stop at a predetermined distance, and the radioactivity on the front and rear surfaces of the article 3 Perform contamination measurements. Thereafter, when it is determined that there is no contamination, the article 3 is returned to the carry-in entrance.

  The effect of the present embodiment is that the individual detectors 5 and 11 to 14 can be moved in proximity to the article 3 independently and simplified. On the other hand, a large space is required for the arrangement of the detectors 5 and 11 to 14.

  Next, a second example of the present embodiment will be described with reference to FIG. When the article 3 is placed on the tray 7 and carried into the housing 30 by the conveyor 4, the article 3 stops at a predetermined position, moves down to the measurement box 15 together with the tray 7 and the lower surface detector 6, and stops at the bottom surface. (The upper surface detector 5 is not shown in FIG. 8). As shown in the figure, in the case of the article 3 having a rectangular shape, the detectors 13, 14, 11, and 12 that can be arbitrarily moved vertically and horizontally in the horizontal direction based on dimensions measured in advance for the article 3 are linearly extended to a predetermined distance. It is set near the article 3 as a measurement position. At this position, the measurement of radioactive contamination of the side surface and the lower surface of the article 3 is performed by the front, rear, left and right detectors 11, 12, 13, 14 and the lower surface detector 6. Next, after the four horizontal detectors 11, 12, 13, and 14 are returned to their original positions, the upper surface detector 5 descends and stops at a predetermined distance, and the radioactivity on the upper surface of the article 3 is detected. Perform contamination measurements.

  According to the second embodiment, a relatively large measurement box 15 is required as compared with the tray 7, so that the installation space is increased. -14 can be brought close to each other, and the radioactivity of each surface can be measured with high sensitivity.

  A third example of the present embodiment is shown in FIG. In this embodiment, the article 3 is set in the corner of the tray 7. (A), (b) shows the initial position of each detector. Next, the front detector 13 is first moved and set at the positions (c) and (d). In this state, the radioactivity of the article 3 is detected by the detectors 13, 14, 11 and 6 on the front, rear, left and lower surfaces. Perform contamination measurements. Next, at (e) and (f), the right side detector 12 moves and the radioactive contamination on the right side is measured. Finally, at (g) and (h), the upper surface detector 5 is lowered and the radioactive contamination on the upper surface of the article 3 is measured.

  According to the present embodiment, the number of times of measurement and the number of measurements increase, but the detectors 13, 14, 11, and 12 on the front, rear, left and right sides can be arranged in the vicinity of the tray 7, so that area saving can be realized, and the monitor can be reduced in size. Can be achieved.

FIG. 3 is an elevational sectional view showing the configuration of the article carry-out monitor according to the first embodiment of the present invention. The block diagram which shows the structure of the goods carrying-out monitor of the 1st Embodiment of this invention. The perspective view explaining operation | movement of the goods carrying-out monitor of the 1st Embodiment of this invention. The perspective view explaining operation | movement of the goods carry-out monitor of the modification of the 1st Embodiment of this invention. The elevation sectional view showing the composition of the article carry-out monitor of the 2nd embodiment of the present invention. The block diagram which shows the structure of the goods carrying-out monitor of the 2nd Embodiment of this invention. The top view explaining the 1st Example of operation | movement of the goods carry-out monitor of the 2nd Embodiment of this invention. The top view explaining the 2nd Example of operation | movement of the goods carry-out monitor of the 2nd Embodiment of this invention. The top view (a), (c), (e), (g) explaining the 3rd Example of operation | movement of the goods carry-out monitor of the 2nd Embodiment of this invention, and side view (b), ( d), (f), (h).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Dimension measuring device, 2 ... Height measuring device, 3 ... Article, 4 ... Conveyor, 5 ... Upper surface detector, 5a, 5b, 5c ... Upper surface / side surface detector, 5d ... Side surface detector, 6 ... Lower surface detector , 7 ... Tray, 8 ... Top / side detector vertical drive motor, 9 ... Top / side detector rotational drive motor, 11 ... Left side detector, 12 ... Right side detector, 13 ... Front side detector, 14 ... Rear side detector DESCRIPTION OF SYMBOLS 15 ... Measurement box 20 ... Radiation detector 21 ... Detector drive device 22 ... Control part 23 ... Operation / display part 24 ... Data processing part 30 ... Housing | casing.

Claims (4)

  A measuring device for measuring the vertical and horizontal dimensions and height of an article carried out from a radioactivity management area, and an upper surface detector and a lower surface detector provided on the upper, lower and side portions of the article for measuring radioactive contamination of the article A left surface detector, a right surface detector, a drive device that moves or rotates at least one of the detectors, and controls the drive device based on a measurement value of the measurement device to control each of the detectors and the article. An article carry-out monitor comprising: a control unit for adjusting a distance between the control unit; and an operation / display unit for inputting a contamination measurement condition and displaying a measurement value.   2. The article carry-out monitor according to claim 1, wherein the upper surface detector and the left surface detector or the right surface detector are integrally formed in an L shape continuously.   The article carry-out monitor according to claim 1, further comprising a tray on which the article is placed, wherein a horizontal width of the tray is extendable. A front detector and a rear detector provided at a front part and a rear part of the article are provided, and the radioactive contamination measurement is performed by sequentially moving the detectors and setting them close to a predetermined distance from the article. The article carry-out monitor according to claim 1.

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