Method for automatically determining measurement time in detection of energy spectrometer

Abstract

The invention discloses a method for automatically determining measurement time in the detection of an energy spectrometer. The method is characterized by comprising the following steps of: (1) tracking and monitoring data collected by the energy spectrometer in real time for a sample to be measured and caching the data; (2) carrying out data pretreatment on the spectral line data tracked and cached in the step (1); (3) acquiring a stability parameter according to the spectral line data tracked currently and the spectral line data treated in the step (2); (4) carrying out stability judgment, automatically judging whether the collection of a current spectral line meets a stability condition or not; and automatically stopping the measurement sampling of the sample if the condition is met, otherwise continuing the measurement sampling and tracking the spectral line data if the condition is not met. By using the method, the measurement time can be automatically determined in the process that the sample is measured by the energy spectrometer; the measurement efficiency of the sample is effectively improved; the influence of environmental change on a measurement result is effectively reduced; and meanwhile, the uncertainty of the measurement time judged manually is reduced.

Description

Technical field [0001] The invention relates to a method for automatically determining the measurement time in the detection of an energy spectrometer. Background technique [0002] High-energy particle detection energy spectrometers, such as NaI spectrometers, have been widely used in building materials radioactivity detection and soil radioactivity detection, and have become one of the test and measurement equipment required by the national standard. The NaI spectrometer generally uses a thick lead chamber as a shield, and the NaI scintillation crystal coupled with a photomultiplier tube constitutes a gamma-ray detector to detect and discriminate the high-energy photons emitted by the sample under test. Since the NaI energy spectrometer has good environmental radiation shielding conditions, and the NaI scintillation crystal has higher detection efficiency and better energy resolution, the NaI detector can perform more accurate measurements on samples with low activity (in sampl...

AI Technical Summary

Problems solved by technology

However, if the measurement time is too long, on the one hand, it will seriously affect the detection efficiency of the sample, and at the same time, it will also be affected by factors such as ambient temperature and instrument stability, thus affecting the measurement results.

[0003] In the current blind test, the selection of the measurement time often depends on the experience of the spectrometer user, which will increase the uncertainty of the measurement results

[0004] The measurement time required for samples with different activities is also different. Compared with samples with high activity, samples with low activity often require longer measurement sampling time in the measurement. However, due to the unknown activity of the sample in the blind test , experimenters tend to take as long as possible to sample, which will waste unnecessary measurement time and affect the detection efficiency of the sample. At the same time, it will also increase the probability of adverse factors such as environmental changes being introduced into the measurement results

Moreover, if it is found that the measurement time is not enough when the sample measurement is completed, the sample will generally be required to be re-measured, which will further affect the measurement efficiency.

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