Method for quickly judging level of radioactive contamination in sample by virtue of gamma spectrometer

Abstract

The invention belongs to the technical field of radioactivity detection, and particularly relates to a method for rapidly judging the level of radioactive contamination in a sample by means of a gammaspectrometer. The method comprises the steps of preprocessing a large batch of measured objects, and shaping the measured objects to form a model with relatively fixed density and structure size; setting a nuclide library of the gamma spectrometer; acquiring front and back channel addresses of a nuclide characteristic energy peak concerned by the nuclide library; determining characteristic energypeak net counting rate values of the measured object at different contamination level limit values in combination with the test, and taking the values as a level judgment basis; and quickly measuringand judging the contamination level of the corresponding characteristic peak gamma nuclide in combination with the dual mode of the net counting rate in the characteristic peak rate and the curve fitting of the characteristic peak channel address interval. According to the method, the accuracy and effectiveness of grade classification of large-batch radioactive waste are further improved.

Description

technical field [0001] The invention belongs to the technical field of radioactive detection, and in particular relates to a method for quickly determining the level of radioactive pollution in a sample by means of a gamma spectrometer. Background technique [0002] In order to realize the final scientific treatment and disposal of radioactive waste, the country has formulated corresponding radioactive waste classification standards. It classifies radioactive waste according to the type of nuclide and the corresponding range of specific activity levels. [0003] For nuclear-related enterprises, especially those engaged in the decommissioning of nuclear facilities and the treatment of three wastes, a large amount of radioactive waste is produced every year, most of which are wastes polluted by γ-ray nuclides. At present, in order to effectively measure the above waste levels in China, the gamma non-destructive testing system is mainly used, but the work efficiency of this me...

AI Technical Summary

Problems solved by technology

If the measured object contains a variety of γ-ray pollution nuclides, and the proportion of each nuclide in the measured object changes, accurate measurement and grade judgment cannot be achieved

[0005] The gamma spectrometer has a good energy spectrum analysis function, but in order to ensure the accuracy of the measurement (mainly to ensure the ideal shape of the characteristic energy peak), the measurement time is long, and it is difficult to use it as a direct measurement instrument to realize the rapid detection and analysis of waste