DEVELOPMENT OF A DYNAMIC FOOD-CHAIN MODEL DYNACON AND ITS APPLICATIONTO KOREAN AGRICULTURAL CONDITIONS

A dynamic food chain model DYNACON was developed to simulate the radio nuclide transfer on agricultural ecosystems. DYNACON estimates the rad ioactivity in each compartment of food chains for three radionuclides, nine plant species and five animal products as a function of the depo sition date. A number of the parameter values used in this study are r epresentative of Korean agricultural conditions. The model was express ed by coupled differential equations and the radioactivity in each com partment was solved as a function of time following an acute depositio n. Although DYNACON is structurally based on existing models, it was d esigned in order to simulate more realistic radionuclide behavior in K orean agricultural conditions and to save computation time. It was fou nd that the radioactivity in foodstuffs depends strongly on the date o f deposition. A comparative study between DYNACON and an equilibrium m odel showed good agreement for depositions that occur during the growi ng season of plants. DYNACON is going to be implemented in a Korean re ar-time dose assessment system FADAS.