Germanium crystal dimension automatic regulation method for high-purity germanium detector passive efficiency scale division

Abstract

The invention relates to radiation measuring technical field, specifically to a germanium crystal size automatic adjustment method with souceless efficiency calibration used in high-purity germanium detector, wherein, a plurality of measuring values of gamma radial omnipotence peak testing efficiency of different Ei energies can be obtained at one testing position, and then the computing valves of all gamma radial omnipotence peak testing efficiency of different Ei can be attained through Monte Carlo analog computation according to the original size of crystal provided by the product instruction of the detector; and error analysis is performed on the efficiency computing value and the measuring value, an efficiency influence formula of the crystal sizes T, R, L on E-energy gamma radial can be calculated under the present crystal sizes through Monte Carlo calculation; a computational efficiency expecting change percentage is set, and an equation group is built to get the size of a new crystal, a final result can be got by repeating the above procedures. The invention can automatically, quickly, accurately determine a high-purity germanium crystal and the size of the sensitive area to effectively ensure the realization of quick Monte Carlo souceless efficiency calibration for high-purity germanium detector.

Description

technical field [0001] The invention relates to the technical field of radiation measurement, in particular to a method for automatically adjusting the size of germanium crystals used for the passive efficiency calibration of high-purity germanium detectors. 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. The most critical crystal sensitive area size is generally difficult to determine. A common method is to manually adjust the size of the crystal sensitive area in combination with experimental results to obtain a satisfactory calculation accuracy. However, the manual adjust...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for automatically adjusting the size of the germanium crystal with the passive efficiency scale of the high-purity germanium detector for the problem that the size of the sensitive area of ​​the high-purity germanium detector crystal is difficult to determine

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