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KMID : 0364920090340030129
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Journal of Radiation Protection and Research
2009 Volume.34 No. 3 p.129 ~ p.136
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The Experience on Intake Estimation and Internal Dose Assessment by Inhalation of Iodine-131 at Korean Nuclear Power Plants
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Kim Hee-Geun
Kong Tae-Young
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Abstract
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During the maintenance period at Korean nuclear power plants, internal exposure of radiation workers occurred by the inhalation of 131I released to the reactor building when primary system opened. The internal radioactivity of radiation workers contaminated by 131I was measured using a whole body counter. Intake estimation and the calculation of committed effective dose were also conducted conforming to the guidance of internal dose assessments from publications of International Commission on Radiological Protection. Because the uptake and excretion of 131I in a body occur quickly and 131I is accumulated in the thyroid gland, the estimated intakes showed differences depending on the counting time after intake. In addition, since ICRP publications do not provide the intake retention fraction (IRF) for whole body of 131I, the IRF for thyroid was substitutionally used to calculate the intake and subsequently this caused more error in intake estimation. Thus, intake estimation and the calculation of committed effective dose were conducted by manual calculation. In this study, the IRF for whole body was also calculated newly and was verified. During this process, the estimated intake and committed effective dose were reviewed and compared using several computer codes for internal dosimetry.
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KEYWORD
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131I, Internal Exposure, Whole Body Counter, Intake, Committed Effective Dose, Intake Retention Fraction
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