JPH05302980A - Detection apparatus of radioactive contamination - Google Patents

Abstract

PURPOSE:To measure hands and feet as well as clothes simultaneously and to restrain an irregularity in an inspection from being caused by a method wherein a detector and a person under test are moved automatically at a proper speed while they have been kept at a proper distance. CONSTITUTION:A person under test is mounted on detectors 1, 2 for right-feet use and for left-feet use; the back of feet is inspected and measured. At the same time, the right hand and the left hand are inserted respectively between detectors 3, 4 for left-hand upper-part use and for left-hand lower-part use and detectors 5, 6 for right- hand upper-part use and for right-hand lower-part use. Both hands are inspected. At this time, while detectors 7, 8 for front use and for back use are being moved by means of signals from detectors 9, 10 for front use and for back use, clothes of the person under test are inspected and measured. The detector 7 is held, by means of a front support arm 14 which is expanded and contracted in the front and rear direction, on a front-side rail 13 which is moved up and down on front longitudinal rails (left) 11, (right) 12. The detector 8 performs a measurement while it is being moved up and down, to the right and the left as well as to the front and the rear. Positions of the rails and the arm and the sequence of the measurement are controlled by means of an operation and control part 15, and an inspection result is displayed on a display part 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radioactive contamination detecting device used in a nuclear power plant or the like.

[0002]

2. Description of the Related Art Conventionally, when entering or exiting a place where radioactive isotopes are handled, such as a radiation controlled area, or a place where radioactive isotopes may adhere to limbs / clothes, etc. It is necessary to confirm that there is no contamination due to the attachment of isotopes, and in such a case, a hand foot close monitor that can easily measure the contamination of limbs and clothes is used. However, in the conventional hand-foot-closed monitor, the person to be measured stands on the sole detection unit of the device, inserts both hands into the openings of the hand detection unit, measures the limbs, and then the clothes detector. I took it off the holder and inspected my clothes for contamination.

[0003]

However, in this method, it is time-consuming because clothing measurement is performed after limb measurement.
In addition, when measuring clothes, since the person to be measured moves the detector himself, there is a possibility that inspection unevenness may occur. Further, when the clothes are inspected, if the detector is moved too fast, there is a problem that even if there is contamination, it cannot be detected. It is an object of the present invention to provide a radioactive contamination detecting device capable of shortening the measurement time and suppressing the occurrence of inspection unevenness by simultaneously measuring limbs and clothing.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a right-hand upper detector for detecting the radioactive contamination degree of an inserted right-hand side object from above and a radioactive contamination degree of the right-hand side object from below. A detector for the right hand, a detector for the left hand that detects the radioactive contamination level of the inserted left-hand side object from the top, and a detector for the left hand side that detects the radioactive contamination degree of the left-hand side object from the bottom Device, a front vertical rail built vertically on the front side of the DUT, a front horizontal rail that moves up and down on the front vertical rail, and a front support arm attached to the front horizontal rail via a front support arm. Front position detector that measures the distance to the measurement object, front detector that is attached to the front support arm together with this front position detector to measure the degree of radioactive contamination of the measured object, and front position detector From front detector by front distance signal from A front compensator that corrects the front detection signal and a control unit that controls the position of the front detector by the same front distance signal, a rear vertical rail built vertically on the rear side of the DUT, and this rear vertical rail A rear horizontal rail that moves up and down, a rear position detector that is attached to this rear horizontal rail via a rear support arm to measure the distance to the object to be measured, and a rear support together with this rear position detector. A rear surface detector attached to the arm for measuring the radioactive contamination degree of the measured object, and a rear surface compensator for correcting the rear surface detection signal from the rear surface detector by the rear surface distance signal from the rear surface position detector. A control unit that controls the position of the detector for the rear surface by the distance signal, a detector for the right foot that is provided in the lower right part of the measured object and detects the radioactive contamination degree of the lower right part of the measured object, and a lower left part of the measured object. Is installed on the Detector for the left foot that detects the degree of radioactive contamination in the lower left part of the body, and detectors for the upper right hand, the detector for the lower right hand, the detector for the upper left hand, the detector for the lower left hand, the corrector for the front face, and the correction for the rear face And a contamination calculation control unit for inspecting signals from the detector for the right foot and the detector for the left foot to determine the contamination state.

[0005]

In the radioactive contamination detecting apparatus of the present invention, the degree of radioactive contamination of the inserted right-hand side object is detected from above,
The radioactivity contamination of the right hand side object is detected from the bottom, the radioactivity contamination degree of the inserted left hand side object is detected from the top, the radioactivity contamination degree of the left hand side object is detected from the bottom, and the measured The front vertical rail is built vertically on the front side of the body, the front horizontal rail is moved up and down, the front position detector is attached to the front horizontal rail via the front support arm, and the distance to the measured object is measured. It is attached to the front support arm together with the position detector for measuring the radioactive contamination of the DUT, and the front detection signal from the front detector is corrected by the front distance signal from the front position detector. A vertical vertical rail is built vertically on the rear side, the horizontal horizontal rail is moved up and down, and the position sensor for the rear surface is attached to the horizontal horizontal rail via the rear support arm to measure the distance to the measured object. Rear position detector together with position detector Attached to a support arm to measure the degree of radioactive contamination of the measured object, correct the rear surface detection signal from the rear surface detector by the rear surface distance signal from the rear surface position detector, and for the right foot on the lower right side of the measured object A detector is provided to detect the degree of radioactive contamination at the lower right of the measured object, and a detector for the left foot is provided at the lower left of the measured object to detect the radioactive contamination at the lower left of the measured object, and a detector for the upper right hand. And signals from the lower right detector and left upper detector and left lower detector and front corrector and rear corrector and right foot detector and left foot detector to determine contamination status ..

[0006]

EXAMPLE An example of the present invention will be described below. In FIGS. 1 and 2, 5 is a detector for the upper right hand that detects the radioactive contamination degree of the inserted right-hand side object from above, and 6 is a lower right hand that detects the radioactive contamination degree of the right-hand side object from below. Detector, 3 is a left-hand upper detector that detects the radioactive contamination degree of the inserted left-hand side object from the upper side, and 4 is a left-hand lower detector that detects the radioactive contamination degree of the left-hand side object from the lower side , 11, 1
2 is a front vertical rail vertically built on the front side of the object to be measured, 13 is a front horizontal rail moving vertically on the front vertical rails 11, 12, 9 is a front horizontal rail 13 via a front support arm 14. A front position detector that is attached to measure the distance to the object to be measured, and a front detector 7 that is attached to the front support arm 14 together with the front position detector 9 to measure the degree of radioactive contamination of the object to be measured. , 7a are front surface position detectors 9
A front compensator for compensating the front detection signal from the front detector 7 according to the front distance signal from the front, 11a is a rear vertical rail built vertically on the rear side of the object to be measured, and 13a is on the rear vertical rail 11a. Rear horizontal rail to move up and down, 1
Reference numeral 0 indicates a position detector for the rear surface, which is attached to the rear horizontal rail via a rear support arm to measure the distance to the object to be measured, 8
Is a rear surface detector that is attached to the rear surface support arm together with the rear surface position detector 10 to measure the radioactive contamination degree of the object to be measured, and 8a is the rear surface detector 8 from the rear surface distance signal from the rear surface position detector 10. Rear surface corrector that corrects the rear surface detection signal, 2 is a detector for the right foot that is provided in the lower right part of the measured object and detects the radioactive contamination degree of the lower right part of the measured object, 1 is the lower left part of the measured object A detector for the left foot, which is provided in the body and detects the degree of radioactive contamination of the lower left part of the object to be measured, 15 is a detector 5 for the right upper hand
And right lower detector 6 and left upper detector 3 and left lower detector 4 and front corrector 7a and rear corrector 8a and right foot detector 2 and left foot detector 1
A contamination calculation control unit that inspects the signal from the unit to determine the contamination state. A radiation detector that converts the incident radiation into an electrical signal and a gap detection unit that detects the gap between the radiation detector and the measurement subject, and the gap detection. It is characterized by having a detector movement control circuit for controlling the position of the radiation detector by a signal from the section and a detector movement mechanism for holding the detector and moving the detector by a signal from the detector movement control circuit. It is a hand foot close monitor.

That is, in this embodiment, the detector is automatically moved at an appropriate speed while maintaining an appropriate distance from the person to be measured, so that the limbs and the clothes can be simultaneously measured. In addition, the interval detector detects the interval between the radiation detector and the person to be measured in order to suppress the occurrence of inspection unevenness and ensure reliable measurement, and inputs this detection signal to the release detection movement control circuit. And output the control signal to the detector moving mechanism so that the distance between the person to be measured and the optimum distance for inspection and measurement,
The detector moving mechanism moves the detector according to a signal from the detector movement control circuit.

FIG. 1 shows an embodiment of the present invention. The names of the respective parts are as follows: 1 is a left foot detector, 2 is a right foot detector, 3
Is a left-hand upper detector, 4 is a left-hand lower detector, 5 is a right-hand upper detector, 6 is a right-hand lower detector, 7 is a front detector, 8 is a rear detector, 9 is a front position Detector, 10 is a rear position detector, 11 is a front vertical rail (left), 12 is a front vertical rail (right), 13 is a front horizontal rail, 14 is a front support arm (front), 15 is an arithmetic control unit, Reference numeral 16 is a display unit, and the person to be measured rides on the left foot detector 1 and the right foot detector 2 to perform the inspection measurement of the sole of the foot. At the same time detector 3 for the left hand,
The left hand and the right hand are inserted between the left-hand lower detector 4, the right-hand upper detector 5, and the right-hand lower detector 6, respectively, and hand inspection is performed.
At this time, the front surface detector 7 and the rear surface detector 8 perform the inspection measurement of the clothes of the measurement subject while moving according to the signals from the front surface position detector 9 and the rear surface position detector 10. The front detector is a front vertical rail (left) 11 and a front vertical rail (right).
A front support arm (front) 14 that extends and contracts in the front-rear direction is held on a front horizontal rail 13 that moves up and down 12. Similarly, the rear surface detector 8 also moves while moving up and down, left and right, and back and forth. The position control of these rails and arms, the control of the measurement sequence, and the like are performed by the arithmetic control unit 15, and the inspection result is displayed on the display unit 16.

FIG. 3 shows another embodiment of the present invention.

The person to be measured rides on the left foot detector 16 and the right foot detector 17 to perform the measurement. During this time, the detectors 18 to 21 detect the positions by the position detectors 22 to 25, and are supported and moved by the support arms 26 to 29 to inspect and measure the hands, clothes, and upper surfaces of the feet.

[0011]

As described above, according to the present invention, the measurement of hands, feet and clothes can be performed at the same time, and the measurement time can be shortened. Further, since the detector for measuring clothes automatically moves and measures the optimum position, it is possible to improve the accuracy of inspection of clothes.

[Brief description of drawings]

FIG. 1 is a side view of a radioactive contamination detection device showing an embodiment of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a perspective view showing another embodiment.

[Explanation of symbols]

 1 ... Left foot detector 2 ... Right foot detector 3 ... Left upper hand detector 4 ... Left lower hand detector 5 ... Right upper hand detector 6 ... Right lower hand detector 15 ... Arithmetic control unit

Claims (1)

[Claims] 1. A right-hand upper detector that detects the radioactive contamination degree of an inserted right-hand side object from above, and a right-hand lower detector that detects the radioactive contamination degree of the right-hand side object from below. , A left-hand upper detector that detects the radioactive contamination degree of the inserted left-hand side object from above, a left-hand lower detector that detects the radioactive contamination degree of the left-hand side object from the lower side, and an object to be measured. Front vertical rail built vertically on the front side of the front rail, a front horizontal rail that moves up and down on the front vertical rail, and a distance from the DUT that is attached to the front horizontal rail via a front support arm. A front position detector for measuring, a front detector attached to the front support arm together with the front position detector for measuring the radioactive contamination degree of the object to be measured, and the front position detector According to the front distance signal, the front detector A front compensator for compensating the front detection signal from the above and a control section for controlling the position of the front detector by the same front distance signal, and a rear vertical rail built vertically on the rear side of the measured object, A rear horizontal rail that moves up and down on the rear vertical rail, a rear position detector that is attached to the rear horizontal rail via a rear support arm and measures the distance to the object to be measured, and the rear position detector. A detector for the rear surface attached to the rear support arm together with a detector for measuring the degree of radioactive contamination of the measured object, and a rear surface detection signal from the rear surface detector by a rear surface distance signal from the rear surface position detector. A controller for controlling the position of the detector for the rear surface by the rear surface compensator and a distance signal for the rear surface to be corrected, and a radioactive contamination degree at the lower right portion of the measured object, which is provided in the lower right portion of the measured object. Right foot detection A detector for the left foot, which is provided in the lower left part of the measured object and detects the radioactive contamination degree of the lower left part of the measured object, the right hand upper detector, the right lower hand detector, and the left upper hand Contamination control unit for determining a contamination state by inspecting signals from the left detector, the left lower detector, the front corrector, the rear corrector, the right foot detector, and the left foot detector A radioactive contamination detection device comprising: