Assessment of $^{137}Cs$ for Selection of Reference Site of In Situ Gamma Spectrometry in Some Areas of Jeju Island
Kim, Chang Jong;Cho, Yoon Hae;Kang, Tae Woo;Ko, Seok Hyung;Yun, Ju Yong;Lee, Dong Myeong;
ABSTRACT
Jeju Island is a significant area as a reference site of in situ gamma spectrometry because there are a number of open spaces which includes $^{137}Cs$ above a certain level. In this paper, the pasture within the Hallasan National Park was selected as one of the open spaces of Jeju Island. The homogeneity of $^{137}Cs$ at the site was assessed by analysis of variance on count and by radioactivity concentration obtained through in situ gamma spectrometry. For this purpose, the count of a total of 79 points at 3 sites were measured with less than count uncertainty of 5% for 2000 seconds. In the results of the analysis of variance, the 2 sites were homogeneous, and the remaining 1 site can be specified to be homogeneous through the adjustment of measuring range. The distribution of radioactivity concentration calculated by in situ gamma spectrometry were $53.7{sim}93.2Bq;kg^{-1}$, $30.5{sim}61.0Bq;kg^{-1}$ and $48.8{sim}102Bq;kg^{-1}$ at each site.
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