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Radon Solubility and Diffusion in the Skin Surface Layer
Akihiro Sakoda1, Tsuyoshi Ishida2, Norie Kanzaki1
1Ningyo-toge Environmental Engineering Center, Japan Atomic Energy Agency, 1550 Kamisaibara, Kagamino-cho, Tomata-gun, Okayama 708-0698, Japan.
Radon can be absorbed through the skin during spa treatments. This study models radon diffusion in the stratum corneum, showing higher concentrations at the skin surface, crucial for accurate radiation dose assessments.
Area of Science:
- Radiological Protection
- Biophysics
- Dermatology
Background:
- Radon uptake via skin is a concern in environments like radon spas with high radon activity concentrations in water.
- Accurate dose evaluation requires understanding radon's behavior within skin tissues, particularly the stratum corneum.
Purpose of the Study:
- To numerically demonstrate radon distribution and diffusion within the skin, focusing on the stratum corneum.
- To assess the significance of skin absorption for radon dose evaluation in specific exposure scenarios.
Main Methods:
- Development of a biokinetic model incorporating diffusion theory for the stratum corneum.
- Measurement of radon solubility in the stratum corneum.
- Numerical simulation of radon depth profiles in skin following immersion.
Main Results:
- The diffusion coefficient of radon in the stratum corneum was found to be low, comparable to radon-proof materials.
- Simulations showed radon activity concentration approximately 10^3 times higher at the skin's surface layer compared to the viable layer after 20 minutes of immersion.
- Radon accumulation is primarily concentrated in the superficial skin layers.
Conclusions:
- The study confirms significant radon accumulation in the stratum corneum, influencing surface layer dose.
- Understanding radon's spatial distribution within the skin is essential for precise dose assessment in scenarios like radon spa therapy.
- This data aids in identifying specific target cell layers for specialized skin dose evaluations.
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