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Abstract
A buoy (shallow water light type) -based in situ gamma-ray spectrometry system with a 7.6 cmØ × 7.6 cm NaI(Tl) detector for remote real-time monitoring of gamma-ray emitting radionuclides in surface seawater is presented. To convert measured count rates to radioactivity, the full energy peak efficiency of the detector for radionuclides in seawater was estimated using Monte Carlo simulation with the MCNP code. The efficiency calibration was validated by comparing the results with a sampling analysis of 40K in seawater at the sites where the monitoring systems were deployed. The minimum detectable activity of the system for 137Cs, 134Cs and 131I with gamma-ray measurement time is discussed.

Affiliations

Jong-In Byun  1 , Seok-Won Choi  2 , Myeong-Han Song  2 , Byung-Uck Chang  2 , Yong-Jae Kim  2 , Ju-Yong Yun  2

Jong-In Byun  1 , Seok-Won Choi  2 , Myeong-Han Song  2 , Byung-Uck Chang  2 , Yong-Jae Kim  2 , Ju-Yong Yun  2
1 Korea Institute of Nuclear and Safety, 62 Gwahak-ro Yuseong-gu, 34142, Daejeon, Republic of Korea. Electronic address: k975bji@kins.re.kr.
2 Korea Institute of Nuclear and Safety, 62 Gwahak-ro Yuseong-gu, 34142, Daejeon, Republic of Korea.