User Guide for the Tritium Food Chain and Dose Module FDMH of RODOS-PV4. 0F_02

摘要: The task of the tritium food chain and dose module FDMH in the RODOS system is to give an assessment of the present and future radiological situation with respect to tritium only, to provide input data for the dose combination module and, in the future, for a countermeasure module which may be developed for further RODOS versions. FDMH starts from the contamination of air and precipitation above agricultural production areas and living areas, as well as with specific meteorological data. In the present version, only the environmental transfer of tritiated water (HTO) is consideredThe behaviour of the special tritium radionuclide differs from all others considered in RODOS. Tritium, once deposited, exchanges very fast with all other compartments of the ecosystem as it behaves like water. In addition, the metabolic processes inside the plant-fixation of tritium in the edible parts-depend strongly on the presence of light. Therefore, the consideration of the diurnal cycle, in particular daytime and night-time must be included in a tritium module. This results in extended data requirements, in particular hourly meteorological data are needed.