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KMID : 0364920180430040137
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Journal of Radiation Protection and Research
2018 Volume.43 No. 4 p.137 ~ p.142
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A Copper Shield for the Reduction of X-γ True Coincidence Summing in Gamma-ray Spectrometry
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Byun Jong-In
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Abstract
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Background: Gamma-ray detectors having a thin window of a material with low atomic number can increase the true coincidence summing effects for radionuclides emitting X-rays or gamma-rays. This effect can make efficiency calibration or spectrum analysis more complicated. In this study, a Cu shield was tested as an X-ray filter to neglect the true coincidence summing effect by X-rays and gamma-rays in gamma-ray spectrometry, in order to simplify gamma-ray energy spectrum analysis.
Materials and Methods: A Cu shield was designed and applied to an n-type high-purity germanium detector having an X-γ summing effect during efficiency calibration. This was tested using a commercial, certified mixed gamma-ray source. The feasibility of a Cu shield was evaluated by comparing efficiency calibration results with and without the shield.
Results and Discussion: In this study, the thickness of a Cu shield needed to avoid true coincidence summing effects due to X-γ was tested and determined to be 1 mm, considering the detection efficiency desired for higher energy. As a result, the accuracy of the detection efficiency calibration was improved by more than 13% by reducing X-γ summing.
Conclusion: The X-γ summing effect should be considered, along with γ-γ summing, when a detection efficiency calibration is implemented and appropriate shielding material can be useful for simplifying analysis of the gamma-ray energy spectra.
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KEYWORD
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True coincidence summing, X-ray, Gamma-ray spectrometry
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