JPH02259588A - Detecting device for radiation contaminated part - Google Patents

Abstract

PURPOSE:To reduce the labor and to reduce the quantity of radiation exposure by moving a base through remote operation, and measuring the radiation of a floor, a ceiling, and a wall surface while moving up and down a radiation detector by an elevation device. CONSTITUTION:The base 1 is provided with the driving mechanism composed of wheels 2 and a motor 3 for wheel driving and can be moved through the remote operation. An elevating mechanism provided on the base 1 consists of a column 4, a wire 5, and a motor 6 for taking up the wire and the elevating mechanism is driven through the remote operation to elevate a radiation detecting device 7 which is connected to the wire 5. Then the device 7 consists of a gamma-ray detector 9 inserted into the recessed part of a cylindrical shield body 8 and is made rotatable so as to measure the floor surface, wall surface, and ceiling. Then, the elevation device moves the detector 9 along the wall surface or makes the base 1 travel to move the detector 9 along the floor surface or ceiling, thereby detecting gamma rays. Consequently, the labor is reduced and the quantity of radiation exposure of an operator is reducible.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention is intended for use in indoor (floor, ceiling and wall surfaces) in facilities handling nuclear fuel or radioactive materials such as nuclear power plants.
The present invention relates to a radioactively contaminated part detection device used for detecting radioactively contaminated parts.

(Prior Art) Generally, in facilities handling nuclear fuel or radioactive materials such as nuclear power plants, it may be necessary to detect radioactively contaminated areas such as articles or rooms (floors, ceilings, and walls).

When detecting such radioactively contaminated areas, the conventional method is for workers to conduct a contamination survey of the target object using a survey meter, or, if the target object is a relatively small item, scaffolding material, etc., the method is to use a monitor to carry out the object. The method used is used to detect radioactively contaminated areas.

(Problem i to be solved by the invention) In the conventional method described above, when detecting radioactively contaminated areas on the floor, ceiling, and walls of a room, it is impossible to use an article removal monitor, etc. Detection of radioactively contaminated areas by surveying contamination using a survey meter
It is carried out.

However, in a contamination survey using such a β-ray detector, the range of β-rays is small, so it may cause damage to the target object.
It is necessary to conduct the survey with the J-meter in close contact.1. When the target is large, such as a wall surface, there is a problem that not only a great deal of labor is required, but also that the radiation exposure of the worker increases.

The present invention has been made in response to such conventional circumstances, and is capable of detecting radioactively contaminated parts that can significantly reduce labor compared to the conventional method and reduce the amount of radiation exposure of workers. The aim is to provide equipment.

[Structure of the Invention] (Means for Solving the Problems) That is, the radioactively contaminated part detection device of the present invention includes a base having a drive mechanism and configured to be movable by remote control; The radiation meter 7I#1 is equipped with an elevating device that can be raised and lowered by remote control, and a radiation detector connected to the elevating device, and the radiation detector is moved along the floor, ceiling, or wall surface. It is characterized by detecting radioactively contaminated parts.

(Function) In the radioactively contaminated part detection device of the present invention having the above configuration, the radiation detector can be moved along the floor, ceiling, or wall by moving the base by remote control or raising and lowering the radiation detector using the lifting device. Radiometer 4-1 while moving
I do. Then, a radioactively contaminated part is detected from the fluctuation of the radiation count value per unit time (corresponding to the moving distance).

Therefore, labor can be significantly reduced compared to the conventional method, and the amount of radiation exposure of workers can be reduced.

(Example) Hereinafter, details of the radioactive contaminated part detection device of the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic configuration of a radioactively contaminated part detection apparatus according to an embodiment of the present invention, and in the figure, reference numeral 1 indicates a base. The base 1 is provided with a drive mechanism including wheels 2 and a motor 3 for rotating the wheels 2, and the base 1 is configured to be movable to a desired position by remote control.

Further, on the base 1, there is provided an elevating mechanism consisting of a support 4, a wire 5, a motor 6 for winding up the wire 5, etc., and a radiation detection device 7 is connected to the wire 5 of this elevating mechanism. has been done. The elevating mechanism is driven by remote control, so that the radiation detection device 7 can be moved up and down.

The radiation detection device 7 also includes a cylindrical shielding body 8 made of lead or the like, and a γ
The shielding body 8 blocks gamma rays from directions other than a predetermined direction, and the gamma ray detector 9 is configured to be able to measure only gamma rays from a predetermined direction. Furthermore, as shown in FIG. 2, this radiation detection device 7
When measuring the floor surface (a), when measuring the wall surface (
(b) When measuring a ceiling, it is configured to be rotatable according to (a).

Note that there is a through hole 10 in the lower part of the radiation detection device 7 of the base 1.
is provided to prevent gamma rays from being absorbed by the structural material of the base 1 when measuring the floor surface with the radiation detection device 7 facing downward as shown in FIG. 2(a). is configured to do so.

Also, gamma ray detection! For example, as shown in FIG. 3, a9 includes a preamplifier 11, a linear amplifier 12, a single channel analyzer 13, a multichannel scaler 14,
It is connected to a 4-1 constant circuit consisting of a computer 15 and the like.

Then, by moving this γ-ray detector 9 along a wall surface using a lifting device, or by moving the γ-ray detector 9 along a ceiling or floor surface by moving the base 1 using a drive mechanism, Make line measurements. This gamma ray measurement is a gross count value per unit time during movement or a count value measurement in a certain energy range, and as shown in Figure 4, the detection of contaminated areas is a count value over time (equivalent to distance). This is done by the fluctuation of.

Note that the detection sensitivity at this time increases as the gamma ray detector 9 is brought closer to the surface to be measured (A), as shown by curves A, B, and C in FIG. The farther it is from the surface, the lower it becomes (C). Further, the closer the gamma ray detection ``39'' is to the constant plane, the narrower the surface to be measured becomes, and the farther away it is, the wider the surface to be measured becomes. Therefore, for more effective contamination confirmation, scan n1 is performed with the gamma ray detector 9 and the D1 constant target surface separated to some extent.
After contamination is confirmed, it is efficient to perform scanning measurements close to the surface to be measured in order to pinpoint the exact location of the contamination.

[Effects of the Invention] As explained above, according to the radioactively contaminated part detection device of the present invention, when detecting radioactively contaminated parts on indoor floors, ceilings, and walls, much labor is required compared to conventional methods. Therefore, it is possible to reduce the amount of radiation exposure of workers.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a radioactively contaminated part detection device according to an embodiment of the present invention, FIG. 2 is a diagram for explaining the movement of the gamma ray detector in FIG. 1, and FIG. FIG. 4 is a graph showing a measurement example. 1...Base 2...Wheel 3...Motor 4... ......Strut Fig. 1 Fig. 2 Fig. 5...Wire 6...Motor 7... ...Radiation detection device 8...
...... Shielding body 9 ...... Gamma ray detector 10 ...
・・・Through hole

Claims (1)

[Claims] (1) A base that has a drive mechanism and is configured to be movable by remote control, an elevating device installed on this base and configured to be able to be raised and lowered by remote control, and a radiation detector connected to this elevating device What is claimed is: 1. A radioactively contaminated part detection apparatus, comprising: a radioactively contaminated part detection apparatus, which measures radiation while moving the radiation detector along a floor, a ceiling, or a wall surface, and detects a radioactively contaminated part.