Measurement of nationwide indoor Rn concentration in Japan

Sanada, Tetsuya; Fujimoto, Kenzo; Miyano, Keiji; Doi, Masahiro; Tokonami, Shinji; Uesugi, Masaki; Takata, Yasuyuki

doi:10.1016/s0265-931x(98)00085-x

Cited by 65 publications

(37 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

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

Janik¹,

Bossew

2016

Nukleonika

View full text Add to dashboard Cite

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).

show abstract

Section: Descriptive Statisticsmentioning

confidence: 75%

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

Janik¹,

Bossew

2016

Nukleonika

View full text Add to dashboard Cite

show abstract

“…One significant factor is the Japanese diet with its low fat intake and high intake of several phytochemicals (isoflavones, tea catechines, folate or isothiocyanates). 37,[42][43][44][45] Moreover, indoor radon concentration is relatively low in Japan, 46 which may also contribute to a lower relative risk associated with smoking.…”

Section: Discussionmentioning

confidence: 99%

Cigarette smoking and subsequent risk of lung cancer by histologic type in middle‐aged Japanese men and women: The JPHC study

Sobue

Yamamoto

Hara

et al. 2002

Intl Journal of Cancer

143

116

View full text Add to dashboard Cite

In order to update the findings of relative risk associated with cigarette smoking for lung cancer by histologic type in Japan, the data from a population-based cohort study of 91,738 men and women were analyzed. During 1990 -1999, 422 lung cancer incident cases were identified. The relative risk for all incident cases associated with current smokers versus non-smokers was 4.5 [95% confidence interval (CI): 3.0 -6.8] and 4.2 (95% CI: 2.4 -7.2), for men and women, respectively. When divided by histologic type, relative risk for squamous cell carcinoma and small cell carcinoma was 12.7 (95% CI: 4.7-34.7) and 17.5 (95% CI: 4.9 -62.1), while for adenocarcinoma it was 2.8 (95% CI: 1.6 -4.9) and 2.0 (95% CI: 0.8 -5.0) for men and women, respectively. We confirmed that the lung cancer risk in men rose with increasing cigarette smoking, especially the duration of smoking among current smokers and decreased after the cessation of smoking among former smokers. Unlike the US or European countries, the relative risk did not increase in this updated study, compared with previous studies in 1960s to 1990s in Japan either for all incident cases or for specific histologic types and the magnitude of relative risks was substantially lower than that observed in the US or European countries, especially for adenocarcinoma. © 2002 Wiley-Liss, Inc. Key words: lung cancer; histologic type; cigarette smoking; relative riskRecent trends in lung cancer incidence showed a relative increase in adenocarcinoma as compared with squamous cell carcinoma for both men and women in various countries. [1][2][3][4][5][6] It is hypothesized that this trend is mainly due to the dissemination of low-tar filter cigarettes, 7-9 since filters mainly remove the larger particles in cigarette smoke, which tend to be deposited in the central large bronchus where most squamous cell carcinomas arise. However, such filters do not remove smaller particles, which tend to reach the peripheral region of the lung where adenocarcinomas arise. Moreover, in order to compensate for nicotine intake, smokers of low-tar filter cigarettes tend to inhale more deeply than those of nonfilter cigarettes, which results in more cigarette smoke reaching the peripheral region. Switching from nonfilter to filter cigarettes occurred mostly during in the US, the UK and Japan, where market share of filtered cigarette exceeded that of nonfilter cigarette in 1959, 1967 and 1965, respectively. 10,11 In the US and European countries, this hypothesis is supported by the finding that the magnitude of the relative risk of lung adenocarcinoma associated with cigarette smoking increased in recent studies, just when the usage of low-tar filter cigarette became more widespread among study subjects. It is reported from the US that the risk of lung adenocarcinoma is many times higher for current smokers than non-smokers, i.e., 19.0-fold for men and 8.1-fold for women in the Cancer Prevention Study (CPS) II (1982II ( -1984, while in CPS I (1959 -1961) corresponding estimates were 4.6 and 1.5 for me...

show abstract

“…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%

See 1 more Smart Citation

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.

View full text Add to dashboard Cite

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

show abstract

Measurement of nationwide indoor Rn concentration in Japan

Cited by 65 publications

References 5 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

Cigarette smoking and subsequent risk of lung cancer by histologic type in middle‐aged Japanese men and women: The JPHC study

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

Contact Info

Product

Resources

About