High-purity germanium detector vacuum maintaining system with thermal purification function

Abstract

The invention relates to a high-purity germanium detector vacuum maintaining system with the thermal purification function. The high-purity germanium detector vacuum maintaining system comprises a vacuum maintaining unit and a thermal purification unit. The vacuum maintaining system comprises a mechanical pump, a molecular sieve adsorption trap, a molecular pump, a digital display composite vacuometer, a valve and a vacuum port valve, wherein the mechanical pump, the molecular sieve adsorption trap, the molecular pump, the digital display composite vacuometer, the valve and the vacuum port valve are sequentially connected. The vacuum port valve is communicated with a vacuum chamber of a high-purity detector. The thermal purification unit comprises a bathing rod, a heating belt, a temperature-sensitive probe and a temperature controller. The bathing rod is installed at a copper joint between a cold finger of the high-purity germanium detector and the vacuum chamber. The heating belt is evenly wound around the periphery of the bathing rod. The temperature-sensitive probe is installed in a center hole of the bathing rod. The output end of the temperature-sensitive probe is connected with the temperature controller which outputs a signal to control on-off of the heating belt. The technical problems that the energy resolution is poor and no signals are output due to the vacuum stoppage of the HPGe detector are solved.

Description

technical field [0001] The invention belongs to a maintenance system for vacuum faults of nuclear radiation detectors, in particular to a maintenance system for vacuum faults of high-purity germanium detectors (HPGe detectors) with thermal purification functions. Background technique [0002] High-purity germanium detectors are important measurement equipment for nuclear radiation monitoring, and have many applications in scientific research, industrial and agricultural production, and nuclear environment monitoring. HPGe detectors are prone to failure during long-term use and transportation, and most of the failures are vacuum failures caused by the drop in vacuum in the sealed germanium crystal vacuum chamber. [0003] Due to the low bandgap of germanium, the thermal movement of molecules will generate a large amount of leakage current noise. At the same time, when impurities such as atoms and molecules are adsorbed on the surface of germanium crystals, surface leakage cur...

AI Technical Summary

Problems solved by technology

[0005] The present invention establishes a HPGe detector vacuum maintenance system with thermal purification function for the vacuum failure of the HPGe detector, which solves the technical problem of poor energy resolution or no signal output caused by the vacuum failure of the HPGe detector

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