The dynamic model of transference,accumulation and disappearance of active cobalt in the simulated paddy were studied.The results showed that concentration of 60 Co in paddy water was decreased monotonously with time.The concentration of 60 Co in rice plant was increased to peak a period and then declined,and the magnitude of concetration was:root>strawhusk>brown rice.The concentration of 60 Co in the soil for idendical treatments presents an individual exponential declining with...