JPS58139090A - Selector for radioactive polluted matter - Google Patents

Abstract

PURPOSE:To achieve an efficient selection of polluted matters by a method wherein a pluraity of radiation detectors are arranged continuously along the conveying direction in a mechanism for conveying a matter to be detected and detection outputs thereof are added, multiplied and processed into signals, by which matters to be detected in the pollution are sorted. CONSTITUTION:Detection bodies 102 and 102 are arranged vertically on a body 101 leaving a clearance there between and a belt conveyor 104 is provided between the bodies 102 and 102 to convey clothings 103 to be detected. Radiation detectors 105a-105c are provided along the conveying direction of the conveyor 104 and the detection output thereof is provided to a signal processing circuit 101a to be memorized into a memeory circuit 106. Regarding signals memorized in the circuit 106, those from the detectors 105a and 105b read out delayed each by (2/3)XT and (1/3)XT and those from the detectors 105a-105c added 107 together when the time during which the clothing 103 passes by the body 102 is represented by T. When the added value exceeds the reference, the output of a comparator 108 controls a sorting mechanism 109 thereby enabling an efficient processing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a radiation contaminated object sorting device that detects and sorts out radiation from objects to be detected such as clothing.

[Technical background of the invention]

Generally, in nuclear power generation facilities and the like, areas with high radiation levels are treated as radiation control areas and special pipe layers are installed. When workers enter this radiation controlled area, they must wear special clothing, and when leaving the radiation embroidery area, they must take off this clothing before leaving. The stripped clothes are then washed and reused, but if there is radioactive material on the clothing, the radioactive material will be mixed into the washing water. Therefore, washing water is filtered at a treatment facility to remove radioactive substances before being discharged. This rounding process is carried out by washing to distinguish between clothes coated with radioactive substances and clothes that are not coated with radioactive substances.

Conventionally, the first method was to detect radiation from clothing and distinguish between radioactively contaminated clothes and non-contaminated clothing.
A radiation contaminant sorting device as shown in the figure was used. In the figure, 1 is a main body 1, and this main body 1 is provided with a pair of radiation detectors 2.2. A belt conveyor 4 is provided to convey the clothing 3 to be detected.This belt conveyor 4 emits radiation from the clothing fA3 to be detected.
2 is configured to be fed at a constant speed that is lower than the speed that can be detected. In addition, as shown in Fig. 2, the above main body JK
is provided with an integrator 5 and a comparator 4S6, the integrator 5 integrates the detection value from the radiation detector 2.2, and the comparator 6
The signal from the integration 66 is compared with the reference value set in advance in the comparison 66 to determine the radiation IIPi of the detected clothing 3.
The apparatus is configured to determine the presence or absence of staining. On the other hand, the conveyance path end 1sKFi sorting of the belt conveyor 4 is carried out by mechanism 1.
is provided.

The detected clothing S is sorted based on the judgment signal from the sorting +1AarFi upper level comparator 6, and is configured to be discharged into either one contaminated container or the non-contaminated container 8B.

[Problems with background technology]

The conventional radiation contaminant sorting device has the following problems. That is, there are a plurality of clothes to be detected 3 in the main body J.
When ... is transported, the radiation detectors 2, 2 detect within the detection range with a single one, so it was not possible to determine from which clothing to be detected #1J the radiation was being emitted. This rounding occurs while the detected clothing 3 is being conveyed within the main body 1.

It is not possible to transport another item of clothing to be detected, resulting in lower processing efficiency and a longer time required to process a large amount of clothing to be detected.

[Purpose of the invention]

An object of the present invention is to form a detection main body by arranging a plurality of unit detectors along the transport direction of a transport mechanism, thereby shortening the transport interval of detected clothing and processing a large amount of detected clothing with high efficiency. The object of the present invention is to provide a radioactive contaminant sorting device that is capable of screening radioactive substances.

[Summary of the invention]

The radiation contaminant sorting device according to this invention arranges N radiation detectors (N is plural) along the transport direction of a transport mechanism that transports the detected object, and receives signals from each radiation detector. A signal processing circuit (8) is provided to add and integrate the above signals, and a mechanism is provided to independently input the above signals to this signal processing circuit. 94, to separate the detected objects from uncontaminated detected objects.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIGS. 3 to 5. That is, 101 in FIG. 3 is the main body,
This main body 101WC is provided with detection main bodies J6J, J4)J with gaps in the vertical direction, and between these detection main bodies 101 and 101, the clothes to be detected @ Belt conveyor J as a conveyance mechanism
4F4 is provided. This belt competition 1104 is the detection object @ within the measurement range of the detection bodies JOJ and J6J.
A drive 11bW that moves the belt conveyor 1o4 in a certain series that can detect radiation from J o s.
The detection bodies JOj, J#J are provided with, for example, three sets of radiation detectors 105&, 105 along the conveyance direction of the belt conveyor 104.
b, from 101@, these unit detection II J o
The detection range of the detection main body xox and ios is 3 m...
It is divided equally. As shown in FIG. 4, the main body 101 includes a processing circuit xo1aK for these radiation detectors 1
A storage circuit 10g for storing signals from 05a, . . . is provided.

The signal processing circuit 101aK is an adder circuit J4t.
F is provided, and this adder circuit 101 is stored in the storage circuit 106 to detect each of the nine radiations! 11 e j
The signal from m... is read out, and the detected clothing [71
17 is the time T for passing through the detection main body 101, the signal from the first radiation detection* J e sa is delayed by 2/3 x 7 hours, and the radiation detection @1 of theory 2
It is configured to delay the signal from the osb by IAX 7 hours, synchronize it with the signal from the third radiation detector 10s, and integrate these signals. Further, the signal processing circuit IDl& is provided with a ratio *whxea,
This comparator 1011 compares the signal from the adder circuit 10'1 with a preset reference value, and if the signal from the adder circuit 101 exceeds the reference value, it detects the detected clothing. It is configured to determine that JJtJ is contaminated by radiation and output a determination signal. At the conveyance terminal end of the belt conveyor 104, there is a sorting mechanism 1.
0# is provided, and for this sorting, the mechanism 10m transfers the detected clothing JOJ conveyed by the judgment signal from the comparator 108-tP- to either the contaminated container 110mk or the non-contaminated container 110b. It is configured to discharge at

The nine embodiments of the present invention constructed as described above have the following effects.

The nine detected clothes 10J are conveyed between the detection bodies 102 and 101, and each radiation detector 105m and 101b.

105@ sequentially, and at this time, the detected clothing JlflJ
Each radiation detection @ 10
J a, 10 j b, 1 #5 c is the 6th
As shown in the figure, detection signals 110m, 110b, 110e
Output sequentially. And each of these detection signals 110m.

110b and 110@ are stored in the Ki circuit 10g.

Then, the adder circuit 10'l sequentially reads each of the detection signals 110m, 110b, and 110a stored in the storage circuit 301, delays the detection signal 110a by 2/'l x 7 hours, and delays the detection signal 110b by IAX 7 hours. As shown in Figure 6, these detection signals 110m,
110b with the detection signals 110a, and these synchronized detection signals 110aaj J Ob a J Z
tj e is integrated over IAX 7 hours to calculate the radiation dose from the detected clothing J0S.

Therefore, the clothing to be detected 103 is the first radiation detector 1
11, the next detected garment is transferred to the detection main body 102.
11 can be included in the bag, thereby significantly shortening the conveyance interval of the detected clothing and improving processing efficiency.

Note that the present invention is not limited to the above embodiments. The detection range is divided in the width direction of the belt conveyor 104 as shown in FIG.
J'J l... can also be arranged. In this case, for example, socks 1 are placed on the belt conveyor 104° in the width direction.
Escape efficiency can be further improved by arranging small items such as gloves for escape. In this case, it goes without saying that the sorting mechanisms may also be provided in parallel.

〔Effect of the invention〕

The radiation contaminant sorting device according to the present invention arranges N radiation detectors (N is plural) along the transport direction of a transport mechanism that transports the object to be detected, and adds signals from each radiation detector. A signal processing circuit for integration is provided, and the above signals are independently input to this signal processing circuit, and a mechanism is provided for sorting between detected objects contaminated with radiation and those contaminated with radiation. There are 9 things to sort out the untested materials. Therefore, as soon as the detected clothing passes the radiation detector on the most upstream side in the transport direction, the next detected clothing can be transported immediately, which greatly shortens the transport interval of the detected clothing and improves processing efficiency. The effects are great, such as the ability to improve performance.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view showing a conventional radiation contaminant sorting device, Fig. 2 is a configuration diagram of snack food, Fig. 31jA is an external perspective view showing an embodiment of the present invention, Fig. 4 is an overall configuration diagram of the same, jI5 Figures and jI6 diagrams show each radiation detection I)'J msh s J
oIIb, Il indicating the detected radiation of J us@
awJ%#I7 is an external perspective view showing a modification of the present invention. JOJ...Main body, 102...Detection main body, 1011.
...Value detection clothes - (object to be detected), 104...Belt conveyor (conveyance mechanism), J)4m...Drive mechanism, 105m
, b, e...Radiation detector, JOJ&...signal processing circuit, 10#...memory circuit, iay...addition circuit,
101... Comparative fluency, 10fl... Sorting is a mechanism, JJ
Ialkl, 6...Detection signal.

Claims (2)

[Claims] (1) A transport mechanism that transports the object to be detected, 9N (however, N is plural) radiation detectors that are continuously arranged along the transport direction of this transport mechanism, and 1 each of these radiation detectors is arranged in a predetermined manner. a drive mechanism for transporting the transport mechanism at a constant speed so that the object to be detected passes through each radiation detector in a time T/N, where the time required for rounding to obtain measurement sensitivity is 2; and a drive mechanism for transporting the transport mechanism at a constant speed; A signal processing circuit receives the detection signals of the detector independently and adds and integrates each signal, and the signal from this signal processing circuit detects the detected object contaminated with radiation and the contaminated object. A radiation contaminant sorting device characterized by comprising a sorting mechanism for sorting detected objects. (2) The signal processing circuit includes a storage circuit, an addition circuit, and a comparator, the storage circuit stores detection signals from each of the radiation detectors, and the addition circuit is stored in the storage circuit. The detection signal is read out, and the detection signal of the radiation detector at the 1-N point from the downstream side in the transport direction of the transport mechanism is delayed by (m-1/N) x times, and the detection signal from each radiation detector is delayed by (m-1/N) x times. Add and integrate each signal over a period of time,
4IIIk that the comparator is configured to output a predetermined signal by comparing a reference value set in advance with the output signal from the adding circuit. Contaminant sorting device.