A dynamic compartment model for evaluating the transfer of radionuclide into rice-plants after an acute release

Nuclear Environment Research Department, Korea Atomic Energy Research Institute 150 Deokjindong, Yuseong, Daejeon 305-323, Korea

Abstract

A dynamic compartment model was developed to evaluate the transport of accidentally released radionuclides onto rice-fields. In the model, the surface water compartment and shoot-base absorption were introduced to account for the effect of an irrigation which is essential to rice cultivation. Allowance was made for the effect of a soil mixing by a plough and an irrigation before transplanting the rice. The rate of root-uptake and shoot-base absorption were modeled in terms of the function of the biomass. In order to test the validation of the model, some ¹³⁷Cs deposition experiments were carried out for several years while cultivating rice in a greenhouse using soils sampled from rice-fields around Kori, Yonggwang and Ulchin nuclear power plants in Korea. The model prediction agreed well to the experimental results within one order of magnitude.