한국 토양내 천연방사성핵종 중 $^{238}U$, $^{232}Th$, $^{40}K$ 농도를 분석하여 거주민의 방사선피폭을 평가하였다. 분석결과 $^{238}U$, $^{232}Th$, $^{40}K$은 각각 15.77$pm$7.27, 290.05$pm$73.92, 750.30$pm$165.38 Bq/kg 값을 나타냈다. 천연방사성핵종 농도를 바탕으로 산출한 흡수선량률은 213.76$pm$46.37 nGy/hr이며, 동일 지역에서 측정한 공간감마흡수선량률은 123.90$pm$19.18 nGy/hr이였다. 천연방사성핵종($^{238}U$, $^{232}Th$, $^{40}K$)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 $^{238}U$, $^{232}Th$, and $^{40}K$ 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$pm$7.27, 290.05$pm$73.92 and 750.30$pm$165.38 Bq/kg respectively. The absorbed dose rate based on the measured concentrations was 213.76$pm$46.37 nGy/hr, while the spatial gamma absorbed dose rate measured in the same region was 123.90$pm$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.
