Method of high-purity germanium detector efficiency calibration without a radioactive source

A high-purity germanium detector and efficiency calibration technology, applied in the field of radiation measurement, can solve the problems of difficult to determine the size of the crystal sensitive area, high requirements for X-ray machines, long time consumption, etc., and achieve the effect of fast passive efficiency calibration

Active Publication Date: 2007-09-19
CHINA INST FOR RADIATION PROTECTION
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Problems solved by technology

For example, some people in foreign countries use X-ray photos to measure the crystal size, but X-ray photos have high requirements for X-ray machines and can only obtain the appearance size of HPGe crystals, and it is difficult to determine the most critical crystal sensitive area size.
A common practice is to manually adjust the size of the crystal sensitive area in combination with the experimental results to obtain a satisfactory calculation accuracy, but the manual adjustment process is greatly affected by human factors and takes a long time
From practical experience, the manual adjustment method generally takes two weeks to achieve the required calculation error

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[0014] In the invention, after accurately obtaining the high-purity germanium crystal and the size of its sensitive area, the Monte Carlo method is used to directly perform analog calculation, so as to realize the passive efficiency calibration of the high-purity germanium detector. The key factors affecting the accuracy of calculation results are the high-purity germanium crystal and its sensitive area size, and the most important parameters are the following three parameters: crystal dead zone thickness T, crystal radius R, and crystal length L. Figure 1 is a flow chart of the crystal size (T, R, L) adjustment algorithm, and Figure 2 is a schematic diagram of the location of the radioactive source, where the axial distance between the radioactive source and the detector is set to z, and the radial distance is set to ρ.

[0015] Taking the passive efficiency scale of the P-type high-purity germanium detector (model: GEM30P4) of Ortec Company as an example below, after the high...

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Abstract

The present invention relates to a method for a high purity germanium detector efficiency calibration without a radioactive source. Said method is capable of automatically, quickly and correctly ascentaining a high purity germanium crystal and its sensitive region size, then directly performing a simulation calculation adopting a monte carlo method, and then quickly achieving the high purity germanium detector efficiency calibration without a radioactive source.

Description

technical field [0001] The invention relates to the technical field of radiation measurement, in particular to a method for calibrating the passive efficiency of a high-purity germanium detector. Background technique [0002] High-purity germanium (HPGe) detectors are one of the most widely used detectors in radiometry. In radiation measurements it is often necessary to calibrate the efficiency of the detectors used. At present, the Monte Carlo method is used to calibrate the passive efficiency of high-purity germanium detectors, and the simulation calculation is generally performed directly after the crystal size data is accurately obtained. For example, some people abroad use X-ray photos to measure crystal size, but using X-ray photos has high requirements for X-ray machines and can only obtain the appearance size of HPGe crystals, and it is difficult to determine the most critical crystal sensitive area size. A common practice is to manually adjust the size of the crys...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/00G01T1/00G06F19/00
Inventor 马吉增刘立业潘红娟候海权张斌全张勇杨绍文
Owner CHINA INST FOR RADIATION PROTECTION
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