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KMID : 0364920090340040190
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Journal of Radiation Protection and Research
2009 Volume.34 No. 4 p.190 ~ p.194
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Analysis of 766 keV Gamma Peak from NPP Environmental Samples
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Kim Wan
Yang He-Sun
Lee Hae-Young
Park Hae-Soo
Kim Bong-Kui
Park Hwan-Bae
Kim Hong-Joo
Lee Sang-Hoon
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Abstract
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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 95Nb by several research institutes. After the enhancement of liquid radioactive waste disposal facility at Ulchin NPP site, the 95Nb amount in the liquid radioactive waste outflow has drastically reduced, but the expected reduction in 95Nb 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 234Th-234mPa 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 234Th-234mPa 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 234mPa.
It is concluded that 766 keV peaks on gamma spectroscopy of Ulchin NPP environmental amples were mainly from 234mPa, which is one of naturally occurring radionuclides.
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KEYWORD
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Environmental Radioactivity, HPGe Detector, Gamma Spectroscopy
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