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- E-ISSN 2288-8985
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Variation of the Detection Efficiency of a HPGe Detector with the Density of the Sample in the Radioactivity Analysis
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2005, v.18 no.1, pp.59-65
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(2005). Variation of the Detection Efficiency of a HPGe Detector with the Density of the Sample in the Radioactivity Analysis. Analytical Science and Technology, 18(1), 59-65.
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Abstract
When the low level radioactivity sample is measured, it is required to have many samples. For increase of the sample volume, a scattering and absorbing probability of the emitted gamma-ray in the sample are to be increased. In order to correct the self-absorption effect, the counting efficiency must be calibrated according to a geometrical condition and sample density. But, it is impossible to determine efficiency for counting sample using standard source with the same geometrical condition and density. In this study, the measuring efficiencies were determined with various counting containers and densities. In order to compare the self-absorption effect with the sample density in the various sample container,he variation of the counting efficiency with the densities was investigated by adding NaI, which has high solubility and density. Also, they were compared with Monte Carlo simulation. The self-absorption effect was found to be significant in the low energy region below 0.5 MeV.
- keywords
- Radioactivity analysis, HPGe detector, self-absorption, Monte Carlo
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