Subjects: Nuclear Science and Technology >> Particle Accelerator submitted time 2025-06-17
Abstract： [Background]: Well HPGe has the advantage of high detection efficiency is commonly used in the measurement of small sample size samples. The measurement process is necessary to meet the summation correction, but the data of this type of measurement is rarely reported. [Purpose]: Calculation of detection efficiency curves and conformity correction factors for well HPGe. [Methods]: The detection efficiency of HPGe was scaled using commonly used monoenergetic γ nuclide standard sources, and the cascade compliance correction factors for common nuclides such as 60Co, 88Y, 131I, 134Cs, 152Eu, 133Ba, etc. were also measured. [Results]: Measurement results show that the difference between the efficiency value obtained by using 139Ce in the commonly used monoenergetic γ-nuclide standard source and the fitted value can be up to 49%; the conformity effect of the well HPGe has a large influence on the activity measurement results, and the smaller the height of the sample, the larger the conformity correction factor is, and when the height of the sample is 0.5 cm, the conformity correction factor of the 563.23 keV γ-ray omnipotent peak emitted by 134Cs reached 8.00, and the conformity correction factor for the 604.70 keV γ-ray omnipotent peak is 3.01; when the activity of the sample is more than about 1000 Bq, the contribution of the incidental conformity to the total conformity correction factor gradually increases, and the conformity correction factor for the 80.19 keV γ-ray omnipotent peak increases by 10% when the activity of 131I is increased from 1300 Bq to 6300 Bq. [Conclusions]: The measurement data can provide a reference for the selection of well HPGe efficiency scale sources and the correction of nuclide activity measurement results.
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