Iodine-129 has the characteristic properties of long-life and low radiation energies. Accordingly, in considering the iodine-129 discharged to the atmosphere or the marine environment, it is important to establish a methodology for evaluating the environmental impact caused by the long-term accumulation and to develop the measuring techniques of the environmental samples having very low radioactivity. This paper presents an overall review regarding the health physics problems associated with iodine-129. The contents consist of production of iodine-129, source terms monitoring for gaseous and liquid effluents, environmental monitoring, and methods of dose assessment based on the critical pathway and the specific activity method including the dose calculation due to a multi-compartment model. Fukuda,-Seiji (Power Reactor and Nuclear Fuel Development Corp., Tokyo (Japan))
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