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Poltabtim W, Musikawan S, Thumwong A, Omori Y, Kranrod C, Hosoda M, Saenboonruang K, Tokonami S. Estimation of Ambient Dose Equivalent Rate Distribution Map Using Walking Survey Technique in Hirosaki City, Aomori, Japan. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:2657. [PMID: 36768021 PMCID: PMC9916362 DOI: 10.3390/ijerph20032657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 01/26/2023] [Accepted: 01/29/2023] [Indexed: 06/18/2023]
Abstract
At present, much emphasis is placed on the health risks associated with radioactivity present in the environment, especially since the accident at the Fukushima Daiichi Nuclear Power Plant. In this study, a walking survey was conducted in Hirosaki City using a NaI(Tl) scintillation spectrometer to estimate and map the distribution of the ambient dose equivalent rate to monitor the radiological safety of the general public in Hirosaki City, where many nuclear facilities are located nearby. The average (±standard deviation) ambient dose equivalent rate was 0.056 ± 0.020 µSv h-1. By comparison with the measurement data, it was found that the values of 85% of the data obtained using the walking survey technique deviated within ±20% relative to those obtained by spot measurements. Furthermore, the distribution of dose rates obtained in the nighttime survey was not significantly different from those obtained in the daytime.
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Affiliation(s)
- Worawat Poltabtim
- Department of Radiation Science, Graduate School of Health Sciences, Hirosaki University, 66-1 Honcho, Hirosaki 036-8564, Aomori, Japan
- Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Honcho, Hirosaki 036-8564, Aomori, Japan
- Special Research Unit of Radiation Technology for Advanced Materials (RTAM), Faculty of Science, Kasetsart University, Bangkok 10900, Thailand
| | - Saowarak Musikawan
- Department of Radiation Science, Graduate School of Health Sciences, Hirosaki University, 66-1 Honcho, Hirosaki 036-8564, Aomori, Japan
- Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Honcho, Hirosaki 036-8564, Aomori, Japan
| | - Arkarapol Thumwong
- Special Research Unit of Radiation Technology for Advanced Materials (RTAM), Faculty of Science, Kasetsart University, Bangkok 10900, Thailand
- Department of Materials Science, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand
| | - Yasutaka Omori
- Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Honcho, Hirosaki 036-8564, Aomori, Japan
- The Research Center for Safety, Metrology, and Nuclear Quality Technology (PRTKMMN), Research Organization for Nuclear Energy, National Research and Innovation Agency of Indonesia (BRIN), JI. Lebak Bulus Raya No. 49, Jakarta Selatan 12440, DKI Jakarta, Indonesia
| | - Chutima Kranrod
- Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Honcho, Hirosaki 036-8564, Aomori, Japan
| | - Masahiro Hosoda
- Department of Radiation Science, Graduate School of Health Sciences, Hirosaki University, 66-1 Honcho, Hirosaki 036-8564, Aomori, Japan
- Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Honcho, Hirosaki 036-8564, Aomori, Japan
| | - Kiadtisak Saenboonruang
- Special Research Unit of Radiation Technology for Advanced Materials (RTAM), Faculty of Science, Kasetsart University, Bangkok 10900, Thailand
- Department of Applied Radiation and Isotopes, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand
| | - Shinji Tokonami
- Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Honcho, Hirosaki 036-8564, Aomori, Japan
- The Research Center for Safety, Metrology, and Nuclear Quality Technology (PRTKMMN), Research Organization for Nuclear Energy, National Research and Innovation Agency of Indonesia (BRIN), JI. Lebak Bulus Raya No. 49, Jakarta Selatan 12440, DKI Jakarta, Indonesia
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Omori Y, Sasaki R, Otsuki Y, Sorimachi A, Ishikawa T. Walking survey technique for ambient gamma dose rate measurement established in Fukushima Medical University. J NUCL SCI TECHNOL 2022. [DOI: 10.1080/00223131.2021.2023370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Yasutaka Omori
- Department of Radiation Physics and Chemistry, Fukushima Medical University, Fukushima, Japan
- Institute of Radiation Emergency Medicine, Hirosaki University, Hirosaki, Japan
| | - Ryo Sasaki
- MD Program, Fukushima Medical University, Fukushima, Japan
| | - Yuto Otsuki
- MD Program, Fukushima Medical University, Fukushima, Japan
| | - Atsuyuki Sorimachi
- Department of Radiation Physics and Chemistry, Fukushima Medical University, Fukushima, Japan
- Integrated Center for Science and Humanities, Fukushima Medical University, Fukushima, Japan
| | - Tetsuo Ishikawa
- Department of Radiation Physics and Chemistry, Fukushima Medical University, Fukushima, Japan
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Omori Y, Sorimachi A, Gun-Aajav M, Enkhgerel N, Munkherdene G, Oyunbolor G, Shajbalidir A, Palam E, Yamada C. Gamma dose rate distribution in the Unegt subbasin, a uranium deposit area in Dornogobi Province, southeastern Mongolia. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:33494-33506. [PMID: 31529344 DOI: 10.1007/s11356-019-06420-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Accepted: 09/03/2019] [Indexed: 06/10/2023]
Abstract
Unegt subbasin in Dornogobi Province, southeastern Mongolia, contains the Dulaan Uul uranium deposit, for which development for commercial mining has been conducted as of 2015. Zuunbayan is a commune located close to the Dulaan Uul uranium deposit, and residents of Zuunbayan and their livestock can easily approach the uranium deposit area, including an aboveground dump site, which was created as a result of the mining development. The present study measured and analyzed the gamma dose rate (absorbed dose rate in air) distribution in Unegt subbasin using data collected from a car-borne measurement survey. The gamma dose rate increased from the northern (45-65 nGy/h) to the central (50-69 nGy/h, including Zuunbayan) and the southern (54-195 nGy/h, including Dulaan Uul) parts of the study area. The gamma dose rates (up to 195 nGy/h) around the dump site in Dulaan Uul were significantly higher than the background level (< 80 nGy/h) at several points. Additional in-situ measurements showed that the gamma dose rates reached up to 450 nGy/h at these locations, which was primarily attributed to the gamma radiation emitted by 238U series elements. Spatial distribution of gamma dose rates around the dump site revealed that the gamma radiation did not originate from the dump, but from the ground, at the measurement points. Analysis of collected soil samples showed that 238U and 226Ra were concentrated in deeper soil. These results indicate that the gamma dose rates higher than the background level were not associated with the aboveground mine dump; rather, they were very probably caused by presence of uranium deposits close to the ground surface.
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Affiliation(s)
- Yasutaka Omori
- Department of Radiation Physics and Chemistry, Fukushima Medical University, 1 Hikarigaoka, Fukushima, 960-1295, Japan.
| | - Atsuyuki Sorimachi
- Department of Radiation Physics and Chemistry, Fukushima Medical University, 1 Hikarigaoka, Fukushima, 960-1295, Japan
| | - Manlaijav Gun-Aajav
- The Executive Office of the Nuclear Energy Commission, Uildverchid Street 2, Khan Uul District, Ulaanbaatar, Mongolia
| | - Nyamdavaa Enkhgerel
- The Executive Office of the Nuclear Energy Commission, Uildverchid Street 2, Khan Uul District, Ulaanbaatar, Mongolia
| | - Ganbat Munkherdene
- The Executive Office of the Nuclear Energy Commission, Uildverchid Street 2, Khan Uul District, Ulaanbaatar, Mongolia
| | - Galnemekh Oyunbolor
- The Executive Office of the Nuclear Energy Commission, Uildverchid Street 2, Khan Uul District, Ulaanbaatar, Mongolia
| | - Amarbileg Shajbalidir
- Center for Hydrology, Meteorology and Environmental Monitoring of Dornogobi Province, Sainshand, Dornogobi, Mongolia
| | - Enkhtuya Palam
- National Center for Public Health, Ministry of Health, 17 Peace Avenue, Ulaanbaatar, Mongolia
| | - Chieri Yamada
- Department of Public Health Nursing for International Radiation Exposure, Fukushima Medical University, 1 Hikarigaoka, Fukushima, 960-1295, Japan
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