Background Reduction for the <TEX>${\gamma}$</TEX>-Ray Spectrometry of Environmental Radioactivity

Seo, Bum Kyoung; 서범경; Lee, Kil Yong; 이길용; Yoon, Yoon Yeol; 윤윤열; Lee, Dae Won; 이대원

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P-ISSN1225-0163
E-ISSN2288-8985
SCOPUS, ESCI, KCI

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P-ISSN 1225-0163
E-ISSN 2288-8985

e-Submission

Vol.14, No.3

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Background Reduction for the ${\gamma}$-Ray Spectrometry of Environmental Radioactivity

Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985

2001, v.14 no.3, pp.212-220

Seo, Bum Kyoung
Lee, Kil Yong
Yoon, Yoon Yeol
Lee, Dae Won

Seo, B. K., Lee, K. Y., Yoon, Y. Y., & Lee, D. W. (2001). Background Reduction for the <TEX>${\gamma}$</TEX>-Ray Spectrometry of Environmental Radioactivity. , 14(3), 212-220.

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Abstract

This study was performed to establish the analytical method of radium and radon in various environmental samples with the ${\gamma}$-ray spectrometry. The major problem in the measurements of low level ${\gamma}$-ray, such as environmental radioactivity, is the fluctuation of ${\gamma}$-ray background spectrum. To overcome this problem, a nitrogen gas was filled up in the detector chamber to reduce the background counts due to airborne radioactivities, i.e., $^{214}Pb$ and $^{214}Bi$, the daughters of $^{222}Rn$ in air. When nitrogen gas flowed around the detector, peak counts of ${\gamma}$-rays from the daughters of $^{222}Rn$ decreased about 80% below 1 MeV and about 20~50% above 1 MeV. The use of nitrogen purging results in approximately tenfold increment of sensitivity.