Soil-to-Rice Transfer Factors of <sup>137</sup>Cs after Simulated Accidental Depositions onto Kori and Yonggwang Paddy Soils

Choi, Yong-Ho; Lim, Kwang-Muk; Park, Hyo-Guk; Choi, Heui-Joo; Lee, Han-soo

J Radiat Prot > Volume 27(4); 2002 > Article

Article

Journal of Radiation Protection 2002;27(4):207-215.

고리 및 영광 논토양에 대한 ¹³⁷Cs의 모의 사고 침적시 토양-벼 전이계수

최용호, 임광묵, 박효국, 최희주, 이한수

한국원자력연구소

Soil-to-Rice Transfer Factors of ¹³⁷Cs after Simulated Accidental Depositions onto Kori and Yonggwang Paddy Soils

Yong-Ho Choi, Kwang-Muk Lim, Hyo-Guk Park, Heui-Joo Choi, Han-soo Lee

Korea Atomic Energy Research Institute

Received: April 29, 2002; Accepted: October 8, 2002.

ABSTRACT

Undisturbed soil blocks were taken into culture boxes from 11 paddy fields within 5 km radii of Kori and Yonggwang NPPs and carried to a greenhouse where ¹³⁷Cs was applied to the surface of standing water before rice transplanting and during its growth. Transfer factors (m² kg^-1-dry plant) of ¹³⁷Cs applied before transplanting varied with soils by a factor of about 8. The mean was 1.1 X 10^-4 for hulled rice seeds and 2.7 x 10^-4 for straw without significant regional differences. The ¹³⁷Cs applications at the early tillering stage and booting stage resulted in, on the whole, 2~3 and 15~30 times, respectively, higher transfer factors than the application before transplanting. A positive correlation was found between soil organic matter and transfer factor. Generic values of transfer factors were proposed for an acute accidental deposition of ¹³⁷Cs onto Korean paddy fields in different times of the year.

Keywords: paddy soils, Kori, Yonggwang, ¹³⁷Cs, accidental deposition, rice, transfer factor