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Report No.
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Internal dose coefficients for various gastrointestinal absorption fractions (Contract research)

Hirouchi, Jun ; Tokashiki, Yuji*; Takahara, Shogo ; Manabe, Kentaro  

Doses to the public are calculated with internal dose coefficients based on the publications of the International Commission on Radiological Protection (ICRP) in OSCAAR, which is a level 3 Probabilistic Risk Assessment code developed by Japan Atomic Energy Agency (JAEA). The gastrointestinal absorption fraction, $$f_{1}$$, which is one of parameters of internal dose coefficient, is given the recommended value. However, although it has been reported that $$f_{1}$$ has uncertainty, the uncertainty analysis of $$f_{1}$$ has been performed on few radionuclides. In this report, to evaluate the influence of uncertainty of $$f_{1}$$ on the internal dose, we calculated the internal dose coefficient with various $$f_{1}$$, and derive the relationship between the coefficient and $$f_{1}$$. As a result, we indicate that the relationships are expressed by a linear function for radionuclides with a half-life of more than 0.5 days and are expressed by a cubic function for radionuclides with a half-life of less than 0.5 days.

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