JP2647267B2 - Body surface contamination monitor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a body surface contamination monitor installed in a nuclear facility.

[0002]

2. Description of the Related Art Generally, in a nuclear facility such as a nuclear power plant, a body surface contamination monitoring device for measuring radioactive contamination on the surface of a human body is installed at an entrance of a radiation control area or the like.

Conventionally, this type of body surface contamination monitoring device is configured as shown in FIG. 5, and a monitor room 1 for measuring radioactivity of each part of a subject P is formed inside a monitor main body 1. I have. A plurality of radiation detectors 3, 4, 5, 6, 7, 8, 9, 1 are provided at the lower part of the measurement chamber 2 and at the front part and the back part.
0, 11 are provided, and these radiation detectors 3 to
11 is configured to measure the radioactivity of each part (the torso, the feet, the arms, etc.) except the head of the subject P.

[0004] A radiation detector 12 for measuring the radioactivity of the head of the person P to be measured is disposed above the measurement room 2.
The radiation detector 12 is supported by an upper fixed plate 14 of the monitor main body 1 via a pantograph mechanism 13. When the pantograph mechanism 13 is driven to open and close by a drive mechanism 16 via a wire 15, the radiation detector 12 moves up and down. It is designed to move. Note that a head detector 17 for detecting the head of the subject P is provided below the radiation detector 12. When the head detector 17 detects the head of the subject P, the head detector 17 detects the head of the subject P. The movement of the radiation detector 12 is stopped.

By the way, in the conventional body surface contamination monitoring device configured as described above, the radiation detector 12 disposed above the measuring chamber 2 is connected to the upper fixing plate 14 of the monitor main body 1 via the pantograph mechanism 13. Since the monitor body 1 is supported, the height of the monitor main body 1 is increased. For example, when the maximum height of the subject P is 190 cm, the height is about 230 to 240 cm. For this reason, when such a body surface contamination monitoring device is installed in a nuclear facility, the ceiling height of the nuclear facility is usually about 260 to 270 cm, and the space from the top of the monitor body 1 to the ceiling becomes narrow. However, there is a problem that the installation work and the maintenance work are difficult.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to reduce the height of a monitor main body and to easily perform installation work and maintenance work. It is an object of the present invention to provide a body surface contamination monitoring device capable of performing the following.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a monitor body having a measurement room for measuring the radioactivity of each part of a person to be measured, and a monitor body provided around the measurement room. A radiation detector comprising: a plurality of radiation detectors; an arm for supporting the radiation detector, which is disposed above the measurement chamber among the radiation detectors; and a driving mechanism for driving the arm in a vertical direction. .

[0008]

According to the above construction, it is not necessary to support the radiation detector disposed above the measurement chamber on the upper fixed plate of the monitor main body via the pantograph mechanism, so that the height of the monitor main body can be reduced. Can be.

[0009]

An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, 1 is a monitor main body, 2 is a measurement room, 3 to 12 are radiation detectors, and 17 is a head detector, which are the same as those shown in FIG.
Reference numeral 18 denotes an arm that supports the radiation detector 12 disposed above the measurement chamber 2. Reference numeral 19 denotes a driving mechanism that drives the arm 18 in the vertical direction.
8, a wire 21 for moving the support member 20 in the vertical direction, a drive pulley 22 for rotating the wire 21 and a motor 24 for driving the drive pulley 22 via a belt 23. It is composed of In the drawing, reference numeral 25 denotes a guide member for guiding the support member 20 in the vertical direction.

In the body surface contamination monitoring device configured as described above, when the driving mechanism 19 drives the arm 18 in the vertical direction, the radiation detector 12 supported by the arm 18 is moved.
Moves up and down. Therefore, in this embodiment, the measurement chamber 2
It is not necessary to support the radiation detector 12 disposed above the monitor body 1 on the upper fixing plate of the monitor main body 1 via a pantograph mechanism, so that the height of the monitor main body 1 can be reduced. As a result, even if the monitor main body 1 is installed in a nuclear facility, the space from the upper part of the monitor main body 1 to the ceiling can be increased, so that the monitor main body 1 can be easily installed and the present apparatus can be easily installed. Can be.

The present invention is not limited to the above embodiment. For example, in the above embodiment, the arm 21 is moved in the vertical direction by driving the wire 21 to pivot, but as shown in FIG. 2, the arm 18 is attached to the slide member 26, and the slide member 26 is attached to the ball screw mechanism 27.
To move the arm 18 in the vertical direction. Further, in the above embodiment, the arm 18 is provided on the rear side of the measurement chamber 2, but as shown in FIG.
8 may be provided on the front side of the measurement chamber 2.

Although the radiation detector 12 is supported by one arm 18 in the above embodiment, the radiation detector 12 may be supported by two arms 18 as shown in FIG.

[0014]

As described above, the present invention relates to a monitor main body having a measurement room for measuring the radioactivity of each part of a person to be measured, and a plurality of radiation detectors arranged around the measurement room. And an arm for supporting the radiation detector disposed above the measurement chamber, and a drive mechanism for vertically driving the arm. Therefore, it is not necessary to support the radiation detector disposed above the measurement chamber on the upper fixed plate of the monitor main body via the pantograph mechanism, so that the height of the monitor main body can be reduced, whereby the monitor main body can be reduced. Since the space from the top to the ceiling can be increased, the monitor body can be easily installed and maintenance work can be easily performed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a body surface contamination monitoring device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a part of a body surface contamination monitoring device according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a part of a body surface contamination monitoring device according to a third embodiment of the present invention.

FIG. 4 is a diagram showing a part of a body surface contamination monitoring device according to a fourth embodiment of the present invention.

FIG. 5 is a diagram showing a schematic configuration of a conventional body surface contamination monitoring device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Monitor main body, 2 ... Measurement room, 3-12 ... Radiation detector, 18 ... Arm, 19 ... Drive mechanism.

Claims (1)

(57) [Claims] 1. A monitor body having a measurement room for measuring radioactivity of each part of a person to be measured, a plurality of radiation detectors disposed around the measurement room, and the radiation detector A body surface contamination monitoring device comprising: an arm provided above a measurement chamber for supporting a radiation detector; and a driving mechanism for driving the arm in a vertical direction.