Radon Solubility and Diffusion in the Skin Surface Layer
Abstract
:1. Introduction
2. Materials and Methods
2.1. Measurement of Radon Partition Coefficients
2.2. Biokinetic Model for Inhaled and Skin-Absorbed Radon
3. Results
4. Discussion
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
- United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR). Sources, Effects and Risks of Ionizing Radiation. UNSCEAR 2019 Report to the General Assembly, with Scientific Annexes; United Nations: New York, NY, USA, 2020. [Google Scholar]
- United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR). Sources and Effects of Ionizing Radiation. UNSCEAR 2000 Report to the General Assembly, with Scientific Annexes; United Nations: New York, NY, USA, 2000. [Google Scholar]
- Hofmann, W.; Winkler-Heil, R.; Lettner, H.; Humber, A.; Gaisberger, M. Radon transfer from thermal water to human organs in radon therapy: Exhalation measurements and model simulation. Radiat. Environ. Biophys. 2019, 58, 513–529. [Google Scholar] [CrossRef] [PubMed] [Green Version]
- Sakoda, A.; Ishimori, Y.; Tschiersh, J. Evaluation of the intake of radon through the skin from thermal water. J. Radiat. Res. 2016, 57, 336–342. [Google Scholar] [CrossRef] [PubMed] [Green Version]
- Hofmann, W.; Lettner, H.; Humber, A. Dosimetric Comparison of exposure pathways to human organs and tissues in radon therapy. Int. J. Environ. Res. Public Health 2021, 18, 10870. [Google Scholar] [CrossRef] [PubMed]
- Sakoda, A.; Ishimori, Y.; Kanzaki, N.; Tanaka, H.; Kataoka, T.; Mitsunobu, F.; Yamaoka, K. Dosimetry of radon progeny deposited on the skin in air and thermal water. J. Radiat. Res. 2021, 62, 634–644. [Google Scholar] [CrossRef] [PubMed]
- Sajon, E.P.; Maier, A.; Hinrichs, A.; Kraft, G.; Drossel, B.; Fournier, C. A combined experimental and theoretical study of radon solubility in fat and water. Sci. Rep. 2019, 9, 10768. [Google Scholar] [CrossRef] [PubMed]
- Nussbaum, E.; Hursh, J.B. Radon solubility in fatty acids and triglycerides. J. Phys. Chem. 1958, 62, 81–84. [Google Scholar] [CrossRef]
- Pappas, A. Epidermal surface lipids. Derm.-Endocrinol. 2009, 1, 72–76. [Google Scholar] [CrossRef] [PubMed] [Green Version]
- Picardo, M.; Ottaviani, M.; Camera, E.; Mastrofrancesco, A. Sebaceous gland lipids. Derm.-Endocrinol. 2009, 1, 68–71. [Google Scholar] [CrossRef]
- Ishimori, Y.; Tanaka, H.; Sakoda, A.; Kataoka, T.; Yamaoka, K.; Mitsunobu, F. Measurements of radon activity concentration in mouse tissues and organs. Radiat. Environ. Biophys. 2017, 56, 161–165. [Google Scholar] [CrossRef]
- Shubert, M.; Paschke, A.; Lieberman, E.; Burnett, W.C. Air-water partitioning of 222Rn and its dependence on water temperature and salinity. Environ. Sci. Technol. 2012, 46, 3905–3911. [Google Scholar] [CrossRef] [PubMed]
- Leggett, R.; Marsh, J.; Gregoratto, D.; Blanchardon, E. A generic biokinetic model for noble gases with supplication to radon. J. Radiol. Prot. 2013, 33, 413–432. [Google Scholar] [CrossRef] [PubMed]
- Roy, A.; Georgopoulos, P.G. Mechanistic Modeling of Transport and Metabolism in Physiological Systems; Technical report CCL/EDMAS-02; Environmental and Occupational Health Sciences Institute: Piscataway, NJ, USA, 1997; Available online: https://www.ccl.rutgers.edu/ccl-files/reports/EDMAS/T-11_CCL-EDMAS-02.pdf (accessed on 17 February 2022).
- International Commission on Radiological Protection (ICRP). Basic anatomical and physiological data for use in radiological protection: Reference values. ICRP Publication 89. Ann. ICRP 2002, 32, 1–277. [Google Scholar]
- Nagy, K. Clinical and Experimental Tests Carried Out with Medicinal Water and Medicinal Caves Containing Radon. Ph.D. Thesis, University of Szeged, Szeged, Hungary, 2008. Available online: http://doktori.bibl.u-szeged.hu/id/eprint/1174/ (accessed on 17 February 2022).
- Tempfer, H.; Schober, A.; Hofmann, W.; Lettner, H.; Steger, F. Biophysical mechanisms and radiation doses in radon therapy. In Radioactivity in the Environment; McLaughlin, J.P., Simopoulos, S.E., Steinhäusler, F., Eds.; Elsevier: Amsterdam, The Netherlands, 2005; Volume 7, pp. 640–648. [Google Scholar]
- Furuno, K. Studies on trace elements in the field of balneology (II) Determination of radon contents in the air of radioactive spa areas, and excretion of radon in expiratory air after using spring water. J. Jpn. Soc. Balneol. Climatol. Phys. Med. 1982, 45, 49–67, (In Japanese with English abstract). [Google Scholar]
- Schubert, M.; Paschke, A.; Bednorz, D.; Bürkin, W.; Stieglitz, T. Kinetics of the water/air phase transition of radon and its implication on detection of radon-in-water concentrations: Practical assessment of different on-site radon extraction methods. Environ. Sci. Technol. 2021, 46, 8945–8951. [Google Scholar] [CrossRef] [PubMed]
- Clever, H.L. Solubility Data Series, Volume 2: Krypton, Xenon, and Radon—Gas Solubilities; Pergamon Press: Oxford, UK, 1979. [Google Scholar]
- Ishimori, Y.; Lange, K.; Martin, P.; Mayya, Y.S.; Phaneuf, M. Measurement and Calculation of Radon Releases from NORM Residues; Technical Report Series No. 474; International Atomic Energy Agency (IAEA): Vienna, Austria, 2013. [Google Scholar]
- Kumar, A.; Chauhan, R.P. Measurement of the optimal thickness of radon-resistant materials for insulation using diffusion coefficient. J. Radioanal. Nucl. Chem. 2021, 327, 425–432. [Google Scholar] [CrossRef]
- Jiránek, M.; Kotrbatá, M. Radon diffusion coefficients in 360 waterproof materials of different chemical composition. Radiat. Prot. Dosim. 2011, 145, 178–183. [Google Scholar] [CrossRef] [PubMed]
Parameter | Value | Reference | |
---|---|---|---|
Askin (m2) | Skin surface area for other than the head | 17,575 (male) 15,355 (female) | Calculated from [15]. |
Skin surface area for the head | 1425 (male) 1245 (female) | ||
Fskin (m3 s−1) | Blood flow rate in the skin for other than the head | 5.01 × 10−6 (male) 4.55 × 10−6 (female) | Calculated from [15]. |
Blood flow rate in the skin for the head | 4.06 × 10−7 (male) 3.69 × 10−7 (female) | ||
LSC (m) | Thickness of the stratum corneum | 10 × 10−6 (for normally clothed regions of the body) | Approximated from [15]. |
PSC/water (dimensionless) | SC-to-water partition coefficient | 33.3 (at 37 °C) | Calculated from PSC/air = 6.43 (see the text and Table 2) and Pair/water = 5.17. |
Pskin/blood (dimensionless) | Skin-to-blood partition coefficient | 0.4 | Taken from [13]. |
PVS/SC (dimensionless) | VS-to-SC partition coefficient | 0.0267 | |
VVS (m3) | Volume of the viable skin for other than the head | 2.61 × 10−3 (male) 1.82 × 10−3 (female) | Calculated from [15]. |
Volume of the viable skin for the head | 2.85 × 10−4 (male) 1.98 × 10−4 (female) |
Sample | Psample/air (−) | ||||
---|---|---|---|---|---|
20 °C | 30 °C | 37 °C a | 40 °C | ||
Triolein (TG) | 5.18 ± 0.55 (4.08, 6.16) | 4.54 ± 0.45 (3.99, 5.26) | 4.28 (3.42, 5.14) | 4.19 ± 0.54 (3.09, 5.17) | |
Oleic acid (FFA) | 7.68 ± 0.13 (7.41, 8.04) | 6.99 ± 0.11 (6.70, 7.10) | 6.32 (6.06, 6.59) | 6.03 ± 0.20 (5.76, 6.39) | |
Methyl myristate (WE) | 9.34 ± 0.48 (8.49, 10.4) | 7.93 ± 0.43 (7.60, 8.58) | 7.26 (6.62, 7.91) | 6.99 ± 0.11 (6.14, 7.69) | |
Squalene (SQ) | 9.02 ± 0.31 (8.33, 9.52) | 7.72 ± 0.36 (7.52, 8.27) | 7.17 (6.67, 7.66) | 6.95 ± 0.13 (6.27, 7.45) | |
Sebum b | Measured | 8.04 ± 0.18 (7.54, 8.71) | 7.31 ± 0.33 (6.76, 7.50) | 6.43 (5.94, 6.92) | 6.04 ± 0.30 (5.54, 6.71) |
Calculated c | 7.21 ± 0.27 (5.71, 8.59) | 6.27 ± 0.22 (5.51, 7.20) | 5.80 (4.73, 6.87) | 5.61 ± 0.24 (4.26, 6.86) |
Reference | Experimental Condition | DSC (m2 s−1) | ||||||
---|---|---|---|---|---|---|---|---|
Number of Subjects | Radon Activity Concentration (Bq m−3) | Water Temperature (°C) | Bath Time (min) | Breath Sampling for Radon Measurement | ||||
Water | Air | |||||||
Nagy [16] a | 17 (Male 8; Female 9) | Average: 73 × 103 Range: (65–86) × 103 | <1.9 b | 31 | 60 | Once immediately after bathing. | 5th percentile Mode GM c (median) AM c 95th percentile | 9.7 × 10−15 1.6 × 10−14 6.9 × 10−14 1.4 × 10−13 5.0 × 10−13 |
Tempfer et al. [17] | 1 (Female) | 950 × 103 | 3000 | 37 | 20 | Eleven times during and after bathing. | Best estimate | 2.5 × 10−14 |
Furuno [18] a | 1 (Unknown) | 58 × 103 | 274 | 36 | 60 | Five times during bathing. | Best estimate | 1.5 × 10−13 |
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. |
© 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Share and Cite
Sakoda, A.; Ishida, T.; Kanzaki, N.; Tanaka, H.; Kataoka, T.; Mitsunobu, F.; Yamaoka, K. Radon Solubility and Diffusion in the Skin Surface Layer. Int. J. Environ. Res. Public Health 2022, 19, 7761. https://doi.org/10.3390/ijerph19137761
Sakoda A, Ishida T, Kanzaki N, Tanaka H, Kataoka T, Mitsunobu F, Yamaoka K. Radon Solubility and Diffusion in the Skin Surface Layer. International Journal of Environmental Research and Public Health. 2022; 19(13):7761. https://doi.org/10.3390/ijerph19137761
Chicago/Turabian StyleSakoda, Akihiro, Tsuyoshi Ishida, Norie Kanzaki, Hiroshi Tanaka, Takahiro Kataoka, Fumihiro Mitsunobu, and Kiyonori Yamaoka. 2022. "Radon Solubility and Diffusion in the Skin Surface Layer" International Journal of Environmental Research and Public Health 19, no. 13: 7761. https://doi.org/10.3390/ijerph19137761