222Rn and 226Ra Concentrations in Spring Water and Their Dose Assessment Due to Ingestion Intake

International Journal of Environmental Research and Public Health

Tetsuya Sanada¹  Takakiyo Tsujiguchi²  Takahito Suzuki²  Ryohei Yamada²  Yuki Tamakuma²  Masahiro Hosoda²  Eka Djatnika Nugraha²  Hirofumi Tazoe³  Naofumi Akata³  Kevin Kelleher³  Chutima Kranrod³  Shinji Tokonami³  Kazuki Iwaoka⁴  Yumi Yasuoka⁵  Yuki Narumi⁶  Tomomi Tabe⁶  Yoshiki Tateyama⁶  Anna Okano⁶ 

[1] Department of Radiological Technology, Faculty of Health Sciences, Hokkaido University of Science, Sapporo 006-8585, Japan;Graduate School of Health Sciences, Hirosaki University, 66-1 Honcho, Hirosaki, Aomori 036-8564, Japan;Institute of Radiation Emergency Medicine, Hirosaki University, Hirosaki, Aomori 036-8564, Japan;National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Inage, Chiba 263-0024, Japan;Radioisotope Research Center, Kobe Pharmaceutical University, Kobe, Hyogo 658–8558, Japan;School of Health Sciences, Hirosaki University, Hirosaki, Aomori 036-8564, Japan;

关键词: ²²²Rn;    ²²⁶Ra;    spring water;    activity concentration;    dose assessment;   

DOI  :  10.3390/ijerph19031758

来源: DOAJ

【 摘 要 】

²²²Rn and ²²⁶Ra concentrations of less than a few to several thousands of Bq L⁻¹ have been observed in several underground bodies of water around the world. Although regulations for these concentrations in water have been implemented internationally, there are currently no regulations in place in Japan. However, concentrations that exceed these internationally recognized regulatory values have also been observed in Japan. In this study, concentrations in spring water in the northern part of Japan were measured and the effective dose from intake of the water was evaluated. ²²²Rn concentrations were measured using a liquid scintillation counter, and ²²⁶Ra concentrations were measured using a high purity germanium detector after chemical preparation. The measured ²²²Rn concentrations (=12.7 ± 6.1 Bq L⁻¹) and ²²⁶Ra concentrations (<0.019–0.022 Bq L⁻¹) did not exceed the reference values set by international and European/American organizations. A conservative estimate of the annual effective ingestion dose of 8 μSv for ²²²Rn and ²²⁶Ra obtained in this study is much smaller than the estimated overall annual effective dose of 2.2 mSv from natural radiation to the Japanese population. However, this dosage accounts for 8% of the WHO individual dosing criteria of 0.1 mSv/year for drinking water.

【 授权许可】

Unknown