Anti-Compton and anti-cosmic-ray high purity germanium spectrometer

Abstract

The invention provides an anti-Compton and anti-cosmic-ray high purity germanium spectrometer comprising a lead shielding room and a main detector, a ring detector and a coincidence detector which areinstalled in the lead shielding room. The coincidence detector is arranged above the main detector. The ring detector is a BGO scintillator detector. The middle part of the ring detector is providedwith a cavity. A first installing cavity used for installing the coincidence detector is formed on the upper part of the cavity. A third installing cavity used for installing the main detector is formed on the lower part of the cavity. A second installing cavity used for placing the sample to be detected is formed in the middle part of the cavity. The BGO scintillator detector is used as the ringdetector so that the size is small and the ray detection efficiency is excellent. The ring detector, the coincidence detector and the main detector are arranged on the lower part of the lead shieldingroom, the coincidence detector and the main detector are installed on the upper and lower ends of the middle cavity of the ring detector respectively, and the second installing cavity used for placing the sample to be detected is arranged between the coincidence detector and the main detector so that the arrangement space of the detectors is compact and the size can be reduced.

Description

technical field [0001] The invention relates to the technical field of radioactivity measurement, in particular to an anti-Compton anti-cosmic ray high-purity germanium spectrometer. Background technique [0002] When the gamma ray energy is within the energy range of hundreds of KeV to MeV, the area of ​​the Compton plateau in the energy spectrum measured by the single crystal detector is often relatively large, which makes it difficult to analyze the complex spectrum. The all-energy peak of the lower-energy gamma-ray is superimposed on the Compton plateau of the high-energy gamma energy spectrum. Due to the statistical fluctuation of the technology on the plateau, the accuracy of the area measurement of the all-energy peak of the low-energy gamma-ray is greatly affected, or it may not be possible at all. The all-energy peak of low-energy gamma rays cannot be found. The Compton scattering of high-energy rays tends to cause higher fluctuations of low-energy rays, and even s...

AI Technical Summary

Problems solved by technology

The existing technology only has a single anti-Compton spectrometer or anti-cosmic ray spectrometer, and the two technologies cannot be realized on the same equipment, and the spectrum with low background and low Compton plateau cannot be obtained, which increases the use of equipment cost

Because high-purity germanium spectrometers need to be equipped with heavy low-background lead chambers, especially anti-coincidence lead chambers, it is often time-consuming and laborious to use

In the prior art, NaI detectors are often used as ring detectors. NaI detectors are difficult to achieve large volumes and are prone to deliquescence.

In addition, the existing high-purity germanium spectrometer installs the ring detector and the main detector in the lead shielding room body, and installs the top detector in the upper lead cover. The overall volume of the high-purity germanium spectrometer is relatively large

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