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DOSE ESTIMATION FOR CONTAMINATED SOIL STORAGE IN LIVING ENVIRONMENT
Shizuka Takai1, Asako Shimada1, Takuma Sawaguchi1
1Japan Atomic Energy Agency, 2-4 Shirakata, Tokai-mura, Ibaraki 319-1195, Japan.
Radiation Protection Dosimetry
|November 13, 2019
Summary
Radiocesium-contaminated soil from Fukushima is stored at sites outside the prefecture. This study found annual exposure doses for residents and site users are significantly less than 1 mSv/y, confirming storage safety.
Area of Science:
- Environmental Science
- Radiation Safety
- Nuclear Decontamination
Background:
- Radiocesium-contaminated soil from Fukushima decontamination is stored at various sites outside the prefecture.
- Current safety assessments in Decontamination Guidelines do not fully evaluate additional exposure from these storage sites, especially for unrestricted site users.
Purpose of the Study:
- To evaluate the current exposure doses for residents and users of radiocesium-contaminated soil storage sites outside Fukushima.
- To assess the safety and effectiveness of ongoing soil storage practices.
Main Methods:
- Dose assessment for residents living near storage sites.
- Dose assessment for individuals entering storage sites annually.
- Evaluation based on the current storage situation outside Fukushima prefecture.
Main Results:
- Annual exposure doses for residents were found to be between 10^-2 and 10^-3 mSv/y.
- Annual exposure doses for site users entering storage sites were on the order of 10^-3 mSv/y.
- Total exposure is confirmed to be significantly less than 1 mSv/y.
Conclusions:
- The current storage of radiocesium-contaminated soil outside Fukushima poses a minimal exposure risk.
- Annual doses for residents and site users are well below the regulatory threshold, validating the storage practices.
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