Standard source for radioactive waste barrel segmenting gamma scanning device scales

Abstract

The invention belongs to the technical field of radioactive sources used for transmitting dose values, and discloses a standard source for radioactive waste barrel segmenting gamma scanning device scales. The standard source comprises a waste barrel, tubes located in the waste barrel, source supports and radioactive source containers filled with gamma radioactive source; the source supports are locate in the tubes, the tubes are located in the waste barrel, the source supports are formed by connecting source support units sequentially from up to down, and the radioactive source containers filled with the gamma radioactive source are located in the source support units. The standard source is flexible in structure and convenient to store and transport, and is adaptable to radioactive waste barrel segmenting gamma scanning device scales with different matrixes.

Description

technical field [0001] The invention belongs to the technical field of radioactive sources used for dose value transfer, and in particular relates to a standard source used for the calibration of radioactive waste bucket segmented gamma scanning devices. Background technique [0002] During the production, operation and decommissioning of nuclear facilities, a large amount of radioactive solid waste is generated, and the waste generation unit usually reconditions these wastes and puts them into standard waste bins. Before disposing of these nuclear wastes, they must be accurately identified and measured to distinguish the types of nuclear materials contained in the waste and accurately measure the amount of nuclear materials contained in them, so that the nuclear waste can be processed and disposed of. At present, the segmental gamma scanning method SGS is mostly used in the world to carry out the overall rapid determination of the waste bin. The measurement principle is: a...

AI Technical Summary

Problems solved by technology

[0003] SGS devices are widely used due to their shorter measurement times and lower cost, but their calibration and calibration have also presented many challenges

First, since the residue in the waste barrel and the matrix of the waste sample contain various mixtures of graphite, calcium fluoride, cotton yarn, rag, rubber, etc., and the density of the sample matrix varies greatly, it is difficult to accurately correct the γ of the sample itself. The self-absorption of rays, especially the low energy of γ-rays and the self-absorption of samples with high matrix density are more difficult to correct; second, due to the complex composition of radionuclides and matrix materials in the analyzed samples, when calibrating the instrument, it is necessary to First, a series of calibration standards similar to the sample to be tested are used to calibrate the gamma energy spectrum non-destructive analysis and measurement device, and preparing different types of calibration standards will consume a lot of energy and money; third, the measurement of the SGS device is based on On the basis of the uniform distribution of each segment, the standard sample used for calibration must have known activity and the distribution of radioactive substances must be uniform. For solid-state filling matrix, it is difficult to uniformly disperse radionuclides inside it; Fourth, due to The SGS device itself is relatively bulky, and only the standard sample of the waste barrel can be passed when verifying or calibrating the scale

Waste bins with different specifications from 50L to 400L, there are difficulties in storage and transportation of a series of radioactive standard samples prepared by the uniform filling method

Images