Carbon-14 (
14C) is a particularly interesting radionuclide from the perspective of dose estimation due to the nuclear fuel cycle. The International Atomic Energy Agency (IAEA) programme on Environmental Modelling for RAdiation Safety (EMRAS) includes a tritium (
3H) and
14C working group (TCWG), the goal of which is to establish the confidence in the predictions of environmental
3H and
14C models. The TCWG has developed two scenarios regarding
14C called “Rice scenario” and “Potato scenario”, respectively, in which various model predictions were compared with observations. The rice scenario is supported by 10-year monitoring data from 1991 to 2001 collected by Japan Atomic Energy Agency (JAEA) around the Tokai reprocessing plant, which provides a good test of models that predict
14C concentrations in air and rice plants growing very close to a continuous atmospheric source of
14C. The potato scenario is based on the data obtained by a series of experiments on
14CO
2 exposure to crops in a wind tunnel, giving a model-data comparison on
14C dynamics in the plant under an acute exposure condition. This report presents some parts of ongoing discussion on the scenarios in the TCWG.
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