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Background Reduction for the <TEX>${\gamma}$</TEX>-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,
B. K., Lee,
K. Y., Yoon,
Y. Y., &
Lee,
D.
W.
(2001). Background Reduction for the <TEX>${\gamma}$</TEX>-Ray Spectrometry of Environmental Radioactivity. Analytical Science and Technology, 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 <TEX>${\gamma}$</TEX>-ray spectrometry. The major problem in the measurements of low level <TEX>${\gamma}$</TEX>-ray, such as environmental radioactivity, is the fluctuation of <TEX>${\gamma}$</TEX>-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., <TEX>$^{214}Pb$</TEX> and <TEX>$^{214}Bi$</TEX>, the daughters of <TEX>$^{222}Rn$</TEX> in air. When nitrogen gas flowed around the detector, peak counts of <TEX>${\gamma}$</TEX>-rays from the daughters of <TEX>$^{222}Rn$</TEX> 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.
- keywords
- radium, radon, environmental radioactivity, backgroung reduction, nitrogen, <TEX>${\gamma}$</TEX>-ray spectrometry
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