Semi-chromatography gamma scanning method for low-medium radioactive waste barrel measurement

A technology of low radioactivity and scanning method, which is applied in the field of semi-chromatographic gamma scanning for the measurement of medium and low radioactive waste barrels, can solve problems such as reduced accuracy, and achieve the improvement of measurement accuracy, shortening of measurement time, and reduction of the process of circular step measurement. Effect

Active Publication Date: 2015-06-17
SHANGHAI JIAO TONG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

This method has high detection accuracy for the presence of point sources, but the accuracy will decrease in the case of multiple point sources

Method used

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  • Semi-chromatography gamma scanning method for low-medium radioactive waste barrel measurement
  • Semi-chromatography gamma scanning method for low-medium radioactive waste barrel measurement
  • Semi-chromatography gamma scanning method for low-medium radioactive waste barrel measurement

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Embodiment

[0040] Such as figure 1 As shown, this embodiment includes: a waste bucket rotating table 1, a rotating table moving assembly 2, a detector lifting platform assembly 3, a transmission source lifting platform assembly 4, a base 5, and a high-purity germanium detector 7 with a collimator 6 , a transmission source 8 with a shielding block and a data processing module 9, wherein: the rotating table moving assembly 2, the detector lifting platform assembly 3 and the transmission source lifting platform assembly 4 are jointly arranged on the base 5, and the waste bucket rotating table 1, high The pure germanium detector 7 and the transmission source 8 are respectively arranged on the rotating table moving assembly 2, the detector lifting platform assembly 3 and the transmission source lifting platform assembly 4, and the detector lifting platform assembly 3 and the transmission source lifting platform assembly 4 are respectively placed on On both sides of the waste bucket rotating t...

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Abstract

The invention provides a semi-chromatography gamma scanning method for low-medium radioactive waste barrel measurement. A rotary platform, a detector platform, a detector with a collimator, a transmission source platform, a transmission source, a shielding part of the transmission source and an analysis module are adopted in the method. A waste barrel is divided into multiple section layers in the height direction, the waste barrel is rotated, surface distribution of radioactive point sources on the section layers is changed into linear distribution of ring sources in the radius direction, the detector conducts measurement at different section layer heights and different eccentric positions in the section layers, an equation set reflecting the mutual relation between the detector counting rate and the activity of nuclide in annular grids is established, the equation set is solved, distribution of the activity of the radioactive nuclide in the waste barrel in the diameter direction and the height direction of the barrel is acquired, and the total activity of the radioactive nuclide in the waste barrel is acquired through summation. The method is high in measurement accuracy, short in measurement time and high in practical value and application prospect.

Description

technical field [0001] The present invention relates to a gamma scanning method and activity reconstruction technology for nuclide and activity measurement of medium and low radioactive barreled waste in nuclear power plants, and a corresponding device based on the technology. Specifically, a radiation detector is used to measure uniform velocity Rotating gamma rays emitted in the waste bin, and then reconstructing the scanning technology of the distribution of radionuclides and their activities along the radial and axial directions of the waste bin. Background technique [0002] With the vigorous development of nuclear power in the country, a large amount of medium and low radioactive waste generated in the operation of nuclear power needs to be disposed of urgently. According to the national standards GB11928-1989, GB9132-1988 and other regulations, these wastes must be tested for surface pollution and dose rate, element identification and activity measurement in the barre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/00
Inventor 王德忠顾卫国钱楠马云巍尹俊连
Owner SHANGHAI JIAO TONG UNIV
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