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Report No.

Dose estimation for astronauts using dose conversion coefficients calculated with the PHITS code and the ICRP/ICRU adult reference computational phantoms

Sato, Tatsuhiko  ; Endo, Akira  ; Sihver, L.*; Niita, Koji*

Absorbed-dose and dose-equivalent rates for astronauts were estimated by multiplying fluence-to-dose conversion coefficients and cosmic-ray fluxes around spacecrafts. The accuracies of the obtained absorbed-dose and dose-equivalent rates were clearly verified by various experimental data measured both inside and outside spacecrafts. The calculation quantitatively shows that the effective doses for astronauts are significantly greater than their corresponding effective dose equivalents because of the numerical incompatibility between the radiation quality factors and the radiation weighting factors.



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