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Report No.
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A Simulation study of personal dose equivalent for external exposure to radioactive cesium distributed in soil

Satoh, Daiki   ; Furuta, Takuya   ; Takahashi, Fumiaki  ; Bolch, W. E.*; Lee, C.*

In the guidance to return to the areas where the evacuation orders have been lifted, the Nuclear Regulation Authority made a statement that the radiation dose of returnees should be assessed based on individual monitoring instead of spatial monitoring with the ambient dose equivalent. The individual monitoring of external exposure is usually performed with a personal dosimeter worn on a body, and the dosimeter indicate a personal dose equivalent Hp(10). Hence, the relationship of the personal dose equivalent to the ambient dose equivalent and the effective dose in the environment contaminated with the radioactive cesium must be quantified to control the radiation exposure of the residents. In the present work, the age-dependent personal dose equivalent is analyzed for the radioactive cesium distributing in soil at a depth of 0.0, 0.5, 2.5, 10.0, and 50.0 g/cm$${^2}$$ by means of the radiation transport code PHITS and the computational phantoms representing the newborn; 1-year old, 5-year old, 10-year old, and 15 year old children, and adults. From the results, it was found that the personal dose equivalent provides an acceptable assessment for the effective dose, and does not exceed the ambient dose equivalent in the contaminated environment.

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