A unique high natural background radiation area - Dose assessment and perspectives

被引：33

作者：

Hosoda, Masahiro ^{[1
,2
]}

Nugraha, Eka Djatnika ^{[1
,3
]}

Akata, Naofumi ^{[2
]}

Yamada, Ryohei ^{[1
,4
]}

Tamakuma, Yuki ^{[1
,2
]}

Sasaki, Michiya ^{[5
]}

Kelleher, Kevin ^{[6
]}

Yoshinaga, Shinji ^{[7
]}

Suzuki, Takahito ^{[1
,12
]}

Rattanapongs, Chanis Pornnumpa ^{[8
]}

Furukawa, Masahide ^{[9
]}

Yamaguchi, Masaru ^{[1
]}

Iwaoka, Kazuki ^{[10
]}

Sanada, Tetsuya ^{[11
]}

Miura, Tomisato ^{[2
]}

Kusdiana ^{[3
]}

Iskandar, Dadong ^{[3
]}

Pudjadi, Eko ^{[3
]}

Kashiwakura, Ikuo ^{[1
]}

Tokonami, Shinji ^{[2
]}

机构：

[1] Hirosaki Univ, Depertment Radiat Sci, Grad Sch Hlth Sci, 66-1 Hon Cho, Hirosaki, Aomori 0368564, Japan

[2] Hirosaki Univ, Inst Radiat Emergency Med, 66-1 Hon Cho, Hirosaki, Aomori 0368564, Japan

[3] Natl Nucl Energy Agcy, Ctr Technol Radiat Safety & Metrol, Jl Lebak Bulus Raya 49, Jakarta 12440, Indonesia

[4] Japan Atom Energy Agcy, Nucl Fuel Cycle Engn Labs, 4-33 Muramatsu, Tokai, Ibaraki 3191194, Japan

[5] Cent Res Inst Elect Power Ind, Radiat Safety Res Ctr, 2-11-1 Iwado Kita, Komae, Tokyo 2018511, Japan

[6] Environm Protect Agcy, Off Radiat Protect & Environm Monitoring, Clonskeagh Rd, Dublin 14, Ireland

[7] Hiroshima Univ, Res Inst Radiat Biol & Med, Minami Ku, 1-2-3 Kasumi, Hiroshima 7348553, Japan

[8] Kasetsart Univ, Fac Sci, Dept Appl Radiat & Isotopes, 50 Ngamwongwan, Bangkok 10900, Thailand

[9] Univ Ryukyus, Fac Sci, Dept Phys & Earth Sci, 1 Senbaru, Nishihara, Okinawa 9030213, Japan

[10] Natl Inst Quantum & Radiol Sci & Technol, Natl Inst Radiol Sci, Ctr Radiat Protect Knowledge, Inage Ku, 4-9-1 Anagawa, Chiba 2638555, Japan

[11] Hokkaido Univ Sci, Fac Hlth Sci, Dept Radiol Technol, 7 Jo 15-4-1 Maeda, Sapporo, Hokkaido 0068585, Japan

[12] Fuji Elect Co Ltd, Dev Div, Radiol Devices Dept, Tokyo Factory, 1 Fuji Machi, Hino, Tokyo 1918502, Japan

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2021年 / 750卷

基金：

日本学术振兴会;

关键词：

High natural background radiation area; Radon; Terrestrial radiation; Internal exposure; External exposure; Dose estimation; THORON PROGENY; RADON; CANCER; MAMUJU; EXPOSURES; MORTALITY; YANGJIANG; KERALA;

D O I：

10.1016/j.scitotenv.2020.142346

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The biological effects of low dose-rate radiation exposures on humans remains unknown. In fact, the Japanese nation still struggles with this issue after the Fukushima Dai-ichi Nuclear Power Plant accident. Recently, we have found a unique area in Indonesia where naturally high radiation levels are present, resulting in chronic low dose-rate radiation exposures. We aimed to estimate the comprehensive dose due to internal and external exposures at the particularly high natural radiation area, and to discuss the enhancement mechanism of radon. A car-borne survey was conducted to estimate the external doses from terrestrial radiation. Indoor radon measurements were made in 47 dwellings over three to five months, covering the two typical seasons, to estimate the internal doses. Atmospheric radon gases were simultaneously collected at several heights to evaluate the vertical distribution. The absorbed dose rates in air in the study area vary widely between 50 nGy h(-1) and 1109 nGy h(-1). Indoor radon concentrations ranged from 124 Bq m(-3) to 1015 Bq m(-3). That is, the indoor radon concentrations measured exceed the reference levels of 100 Bq m(-3) recommended by the World Health Organization. Furthermore, the outdoor radon concentrations measured were comparable to the high indoor radon concentrations. The annual effective dose due to external and internal exposures in the study area was estimated to be 27 mSv using the median values. It was found that many residents are receiving radiation exposure from natural radionuclides over the dose limit for occupational exposure to radiation workers. This enhanced outdoor radon concentration might be as a result of the stable atmospheric conditions generated at an exceptionally low altitude. Our findings suggest that this area provides a unique opportunity to conduct an epidemiological study related to health effects due to chronic low dose-rate radiation exposure. (C) 2020 Elsevier B.V. All rights reserved.

引用

页数：11

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