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J Radiat Prot > Volume 34(4); 2009 > Article
Journal of Radiation Protection 2009;34(4):190-0.
원전주변 환경시료의 766 keV 감마선에너지 피크에 대한 해석
Analysis of 766 keV Gamma Peak from NPP Environmental Samples
Kim, Wan;Lee, Hae-Young;Yang, He-Sun;Park, Hae-Soo;Kim, Bong-Kuk;Park, Hwan-Bae;Kim, Hong-Joo;Lee, Sang-Hoon;
Gamma spectral results for macroalgae samples taken from the environment of Ulchin nuclear power plants in Korea (east coast), showed 766 keV peaks, which were identified as $^{95}Nb$ by several research institutes. After the enhancement of liquid radioactive waste disposal facility at Ulchin NPP site, the $^{95}Nb$ amount in the liquid radioactive waste outflow has drastically reduced, but the expected reduction in $^{95}Nb$ specific activity from environmental samples did not actually show up on gamma spectroscopy. Detailed re-investigation revealed that along with 766 keV peak, other peaks (63, 92 and 1001 keV) from $^{234}Th-^{234}mPa$ decay series were also detected on spectroscopy, and that the measured half lives of the four peaks were very close to known half life of $^{234}Th-^{234}mPa$ decay series, which is 24.1 day. The measured gamma yield ratios of 766 keV peak to 1001 peak were very close to known ratio 0.35 for $^{234}mPa$. It is concluded that 766 keV peaks on gamma spectroscopy of Ulchin NPP environmental samples were mainly from $^{234}mPa$, which is one of naturally occurring radionuclides.
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