A multi-peak stabilization method of low activity gamma energy spectrum

Abstract

The invention discloses a multimodal spectrum stabilizing method of a low-activity gamma power spectrum. The method comprises that (S1) channel addresses of standard characteristic peaks in the gammapower spectrum are obtained via a gamma reference source whose energy is known, equal shadow areas are taken in the left and right sides of each standard characteristic peak, and the absolute value ofthe difference between the areas in the left and right sides of the standard characteristic peak is minimal; (S2) in a channel address interval calibrated by shadows, a difference DeltaN between theshadow areas of the two sides of the characteristic peak in a spectral line to be detected as well as the sum N of the shadow areas in the two sides is calculated, and a relative deviation variable, of three peak total counting rate, eta=DeltaN / N; (S3) the relative deviation variable eta of the three peak total counting rate is compared with a spectrum drift threshold epsilon, and the drift condition of the spectral line to be detected is determined; and (S4) the magnitude of the spectrum drift is calculated, a corresponding control word is obtained, and the high voltage of a detector or the amplification multiple of a spectrum amplifier is adjusted to stabilize the spectrum. The method can be used to measure the low-activity gamma power spectrum, reduce the system error of spectrum stabilization and improve the accuracy of spectrum stabilization.

Description

technical field [0001] The invention relates to a method for stabilizing multi-peak gamma energy spectrum, in particular to a method for stabilizing multi-peak gamma energy spectrum with low activity. Background technique [0002] Radioactivity in the natural environment is largely determined by the type and amount of radionuclides in formation rocks, and 238 U 232 Th-related radioactive systems and radionuclides 40 K are all unstable natural radionuclides, they emit alpha, beta and gamma rays when they decay, and the gamma rays emitted by them and their daughters have specific energy. [0003] In radioactivity measurement work, the measurement of gamma rays is a very important part. There are usually two ways to measure gamma rays: intensity measurement and energy spectrum measurement. Gamma-ray spectrometers can be used to detect and evaluate radioactive mineral deposits (potassium, uranium and thorium), analyze and study stratum depositional environments, identify lith...

AI Technical Summary

Problems solved by technology

[0016] The purpose of the present invention is to provide a low-activity gamma energy spectrum multi-peak stabilization method, which solves the problem that existing methods are not suitable for low-activity gamma energy spectrum measurement, and can realize low-activity gamma energy spectrum measurement, Reduce the systematic error of spectrum stabilization and improve the accuracy of spectrum stabilization

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