한국토양 내 천연 방사성핵종에 의한 거주민의 방사선피폭평가

Evaluation of Radiation Exposure to Residents by Naturally Residing Radionuclides in the Soil of Korea

한국 토양내 천연방사성핵종 중 238U, 232Th, 40K 농도를 분석하여 거주민의 방사선피폭을 평가하였다. 분석결과 238U, 232Th, 40K은 각각 15.77±7.27, 290.05±73.92, 750.30±165.38 Bq/kg 값을 나타냈다. 천연방사성핵종 농도를 바탕으로 산출한 흡수선량률은 213.76±46.37 nGy/hr이며, 동일 지역에서 측정한 공간감마흡수선량률은 123.90±19.18 nGy/hr이였다. 천연방사성핵종(238U, 232Th, 40K)을 대상으로 거주민의 유효선량률은 0.26 mSv/yr로 나타나 UNSCEAR에서 제시한 세계 평균유효선량률인 0.07 mSv/yr보다 높은 값을 나타냈다.

We investigated the amounts of radiation exposure from 238U, 232Th, and 40K which are three major radionuclides naturally residing in soil of the Korean peninsula. The experimental results showed that the concentrations of the radionuclides were 15.77±7.27, 290.05±73.92 and 750.30±165.38 Bq/kg respectively. The absorbed dose rate based on the measured concentrations was 213.76±46.37 nGy/hr, while the spatial gamma absorbed dose rate measured in the same region was 123.90±19.18 nGy/hr. The effective dose rate was 0.26 mSv/yr, which is significantly higher than the world average effective dose rate 0.07 mSv/yr provided by the UNSCEAR.