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Discussion on optimisation below dose limit for public using background-cancer-risk-based approach
1Radiation Safety Research Center, Central Research Institute of Electric Power Industry, 2-11-1 Iwadokita, Komae-shi, Tokyo 201-8511, Japan. thattori@criepi.denken.or.jp
Radiation Protection Dosimetry
|April 19, 2011
Summary
A new background-cancer-risk approach suggests setting the lower bound for radiological protection optimization at 1 mSv y(-1). This level is below the non-concern threshold derived from Japan's background cancer risk standard deviation.
Area of Science:
- Radiological protection
- Radiation risk assessment
- Public health
Background:
- Current radiological protection systems require optimization.
- Establishing a lower bound for optimization is crucial for effective radiation safety.
- Background cancer risk is a key factor in risk-benefit analysis.
Purpose of the Study:
- To propose a novel background-cancer-risk-based approach for determining the lower bound of optimization in radiological protection.
- To evaluate the feasibility of setting the lower bound at 1 mSv y(-1) based on this new approach.
Main Methods:
- Development of a background-cancer-risk-based approach.
- Calculation of the standard deviation of background cancer risk in Japan.
- Comparison of assumed risk from 1 mSv y(-1) with the non-concern level.
Main Results:
- The standard deviation of background cancer risk in Japan was found to be 7.4 × 10(-5) y(-1).
- A risk level corresponding to 1σ of background cancer risk can be considered a non-concern level.
- The assumed risk of 1 mSv y(-1) is approximately 5 × 10(-5) y(-1), which is lower than the non-concern level.
Conclusions:
- The proposed background-cancer-risk-based approach provides a new method for setting the lower bound of optimization.
- A lower bound of 1 mSv y(-1) for radiological protection optimization is potentially feasible.
- This approach offers a more refined basis for radiation protection standards.
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