Nuclear radiation detection method suitable for complex radiation background

Abstract

The invention provides a nuclear radiation detection method suitable for a complex radiation background. The nuclear radiation detection method suitable for the complex radiation background includes: combining a traditional measurement method with a modern digital signal processing technology, fully using information acquired by a nuclear radiation detector, and achieving quick and accurate judgment for nuclear radiation energy and strength. The nuclear radiation detection method suitable for the complex radiation background uses a high speed data acquisition card to acquire gamma pulse signals output from an HPGE (high purity germanium) detector, and inputs the gamma pulse signals into a data acquisition and processing unit after performing AD (analog-digital) conversion and smoothing on the gamma pulse signals. Then, a data processing unit converts a large number of the gamma pulse signals into gamma energy spectra. Finally, continuous wavelet transformation in wavelet analysis is adopted to convert the gamma energy spectra, and converts the gamma energy spectra to an energy-dimension plane, and then wavelet coefficients of the gamma energy spectra under different dimensions are obtained. In the end, quick and accurate positioning for a characteristic peak position is achieved and quick calculation for the peak area is achieved according to characteristics of gamma characteristic peak wavelet coefficients in the energy-dimension plane.

Description

technical field [0001] The invention belongs to the technical field of nuclear radiation measurement, and in particular relates to a nuclear radiation detection method suitable for complex radiation backgrounds. Background technique [0002] As a clean, economical and reliable energy production method, nuclear power generation is of great significance to environmental protection and sustainable economic development, and its position in China's energy construction is getting higher and higher. However, the nuclear radiation accidents of nuclear power plants such as "Chernobyl", "Three Mile Island" and "Fukushima" have brought painful lessons to mankind. Accordingly, in order to ensure the safety of people's health, life and property, the state has adopted a series of measures to build a comprehensive nuclear power safety prevention and control system. To build such a system, it is necessary to make real-time and accurate judgments on the radionuclides in the surrounding envi...

AI Technical Summary

Problems solved by technology

The gamma energy spectrum obtained by the high-purity germanium detector has good energy resolution ability, but due to its small detection efficiency (generally within 5%), it is necessary to measure the sample for a long time in order to achieve the ideal detection result.

This often prevents us from making quick and accurate judgments on nuclear radiation and nuclear leakage accidents, so as to formulate scientific and effective emergency measures

Especially in the complex radiation background, due to the large statistical fluctuation of the energy spectrum and the large amount of interference radiation, it is easy to cause missed and misjudged nuclear radiation

At present, many people have proposed to use the mallat tower algorithm (discrete wavelet transform) in the wavelet analysis method to smooth and filter the energy spectrum, but the effect is not ideal, and this problem has not been fundamentally solved.

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