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In Publication No. 66 of the International Commission on Radiological Protection, an activity medianaerodynamic diameter (AMAD) of 5 μm is considered in internal exposure dose assessment owing to inhalation ofradionuclides in a workplace. However, analysis of aerosols generated during dismantling experiments, such as inthe oxy-cutting of a reactor vessel conducted in Korea, revealed that the radioactive aerosols have AMAD rangingfrom 0.024 to 0.064 μm. Such extremely fine aerosols can induce internal exposure if inhaled. In particular, alpharadionuclides in aerosols can lead to significantly higher levels of radiation exposure than beta and gamma radionuclides,thus highlighting the need to establish appropriate internal exposure radiation protection programs and monitoringsystems that specifically address alpha radionuclides when decommissioning nuclear power plants in Korea.
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