A nationwide survey of outdoor radon concentration in Japan

Oikawa, Shinji; Kanno, Nobuyuki; Sanada, Tetsuya; Ohashi, Naoyuki; Uesugi, Masaki; Sato, Kaneaki; Abukawa, Joji; Higuchi, H.

doi:10.1016/s0265-931x(02)00097-8

Cited by 60 publications

(49 citation statements)

References 12 publications

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“…Of course, this phenomenon has been known for long, but it is stronger in the investigated building than usual in Japan [7,[10][11][12][13] and more similar to what can be observed in Europe [14][15][16][17][18]. It suggests some particular mechanism of infi ltration from indoor sources or from the ground and accumulation in that room, whose nature has not been understood so far.…”

Section: Descriptive Statisticsmentioning

confidence: 75%

“…Moreover, from the long-term survey performed by Kobayashi [10], the radon concentration in a house located near Futsukaichi hot spring ranged from 14 to 184 Bq/m 3 with an arithmetic mean of 45 Bq/m 3 . The annual mean of radon outdoor in Japan was reported by Oikawa [11]. The experiment was carried out throughout Japan from 1997 to 1999 and a geographical-temporal mean value of about 6 Bq/m 3 was found.…”

Section: Descriptive Statisticsmentioning

confidence: 94%

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Analysis of simultaneous time series of indoor, outdoor and soil air radon concentrations, meteorological and seismic data

Janik¹,

Bossew

2016

Nukleonika

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It is well known that the temporal dynamic of indoor and outdoor radon concentrations show complex patterns, which are partly not easy to interpret. Clearly, for physical reasons, they must be related to possibly variable conditions of radon generation, migration and atmospheric dispersion and accumulation. The aim of this study was to analyse long-time series of simultaneously measured indoor and outdoor radon concentrations, together with environmental quantities, which may act as control variables of Rn. The study was performed in Chiba, Japan, using two ionization chambers for parallel indoor and outdoor radon concentrations measurements over 4 years. Meteorological and seismic data were obtained from the Japan Metrological Agency (JMA).

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Section: Descriptive Statisticsmentioning

confidence: 75%

Section: Descriptive Statisticsmentioning

confidence: 94%

Analysis of simultaneous time series of indoor, outdoor and soil air radon concentrations, meteorological and seismic data

Janik¹,

Bossew

2016

Nukleonika

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“…To compare dose rate with background radiation in Japan, reference values were cited from the literatures (24)(25)(26)(27)(28)(29)(30). Regional dose rates of external exposure and radon inhalation were estimated from means among 47 prefectures and 7 regions in Japan (25)(26)(27)(28).…”

Section: Methodsmentioning

confidence: 99%

“…Regional dose rates of external exposure and radon inhalation were estimated from means among 47 prefectures and 7 regions in Japan (25)(26)(27)(28). Variation in internal exposure to 210 Po and 210 Pb was calculated by bootstrapping the dose rate estimates among several cities in Japan into 47 prefectures (1,000 iterations) (29,30).…”

Section: Methodsmentioning

confidence: 99%

“…Japanese people are generally exposed to a background radiation of 2.09 mSv/y (Table S9) (24). Nationwide surveys on terrestrial and cosmic radiation and radon concentration have shown an annual dose ranging from 0.72 to 1.24 mSv among 47 prefectures (25)(26)(27)(28). Internal exposure to 210 Po and 210 Pb has been investigated in several cities in Japan and found to range from 0.15 to 0.81 mSv/y and from 0.03 to 0.16 mSv/y, respectively (29,30).…”

Section: Total Radiation Dose Rates Estimated By Monte Carlo Simulationmentioning

confidence: 99%

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Radiation dose rates now and in the future for residents neighboring restricted areas of the Fukushima Daiichi Nuclear Power Plant

Harada¹,

Niisoe

Imanaka

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

101

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Radiation dose rates were evaluated in three areas neighboring a restricted area within a 20-to 50-km radius of the Fukushima Daiichi Nuclear Power Plant in August-September 2012 and projected to 2022 and 2062. Study participants wore personal dosimeters measuring external dose equivalents, almost entirely from deposited radionuclides (groundshine). External dose rate equivalents owing to the accident averaged 1.03, 2.75, and 1.66 mSv/y in the village of Kawauchi, the Tamano area of Soma, and the Haramachi area of Minamisoma, respectively. Internal dose rates estimated from dietary intake of radiocesium averaged 0.0058, 0.019, and 0.0088 mSv/y in Kawauchi, Tamano, and Haramachi, respectively. Dose rates from inhalation of resuspended radiocesium were lower than 0.001 mSv/y. In 2012, the average annual doses from radiocesium were close to the average background radiation exposure (2 mSv/y) in Japan. Accounting only for the physical decay of radiocesium, mean annual dose rates in 2022 were estimated as 0.31, 0.87, and 0.53 mSv/y in Kawauchi, Tamano, and Haramachi, respectively. The simple and conservative estimates are comparable with variations in the background dose, and unlikely to exceed the ordinary permissible dose rate (1 mSv/y) for the majority of the Fukushima population. Health risk assessment indicates that post-2012 doses will increase lifetime solid cancer, leukemia, and breast cancer incidences by 1.06%, 0.03% and 0.28% respectively, in Tamano. This assessment was derived from short-term observation with uncertainties and did not evaluate the firstyear dose and radioiodine exposure. Nevertheless, this estimate provides perspective on the long-term radiation exposure levels in the three regions.Fukushima nuclear disaster | exposure assessment | Strontium-90 | forest contamination | food duplicate

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Low-Background γ-Spectrometry in Ogoya Underground Laboratory, Ishikawa, Japan

Inoue,

Ochiai

2023

Field Work and Laboratory Experiments in Integrated Environmental Sciences

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A nationwide survey of outdoor radon concentration in Japan

Cited by 60 publications

References 12 publications

Analysis of simultaneous time series of indoor, outdoor and soil air radon concentrations, meteorological and seismic data

Analysis of simultaneous time series of indoor, outdoor and soil air radon concentrations, meteorological and seismic data

Radiation dose rates now and in the future for residents neighboring restricted areas of the Fukushima Daiichi Nuclear Power Plant

Low-Background γ-Spectrometry in Ogoya Underground Laboratory, Ishikawa, Japan

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