Radon and thoron concentrations in offices and dwellings of the Gunma prefecture, Japan

Sugino, Masato; Tokonami, Shinji; Zhuo, Weihai

doi:10.1007/s10967-005-0893-4

Cited by 21 publications

(6 citation statements)

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“…33 Whereas, the observed ratio in the present study was lower than the observed values of 0.9-4.6 found in Hungary 21 and 0.6-6 in Japan. 7 The average 220 Rn/ 222 Rn ratio, 0.71 was observed in the present study which was found to be higher than 0.24 that was observed in Canada, 27 and 0.6 that was found in Hungary. 21 This result could be attributed to a higher concentration of 232 Th than 238 U observed in the soil of the study area.…”

Section: Thoron-to-radon Ratiocontrasting

confidence: 63%

“…Several studies have been conducted on the radon concentrations in the indoor environment and its effect on human health. [7][8][9][10][11] In order to find the indoor radiation dose received, the concentration of radon, thoron and progenies in residential places of Coonoor, South India has been undertaken. This study is a part of a systematic study of natural environmental background radiation of important places on Western Ghats in South India.…”

Section: Introductionmentioning

confidence: 99%

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Variability of radon and thoron concentration with type of dwellings in a hilly area

Sivakumar

2016

Indoor and Built Environment

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Indoor radon, thoron and progenies are major contributors to the indoor radiation dose which have been measured by our study for different types of dwellings during four seasons of a year. The indoor radon, thoron and progeny levels observed in the present study found to vary with seasons of a year. The average highest radon, thoron and progeny were observed during winter and the corresponding lowest values were observed during summer. The highest 222Rn, 220Rn and progenies concentrations were observed in mud houses and the lowest values were recorded in wooden houses. A good correlation with a correlation coefficient of 0.85 was observed between indoor 222Rn and concentration of its grandparent 238U in underlying soil. A moderate correlation was found between 220Rn and 232Th concentration in underlying soil. The effective dose received by the general public in the present study due to radon and thoron was estimated as 1.43 and 1.13 mSv y−1, respectively. The 222Rn and 220Rn progenies contribute 0.79 and 0.25 mSv y−1, respectively to the annual effective dose received. The inhalation dose received by the general public of the study area due to these airborne isotopes 3.69 mSv y−1 is less than the action limit of International Commission of Radiological Protection (ICRP) (2009).

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Section: Thoron-to-radon Ratiocontrasting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Variability of radon and thoron concentration with type of dwellings in a hilly area

Sivakumar

2016

Indoor and Built Environment

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“…[22] and Sugino et al . [10] showed that if the ratio of Tn/Rn exceeded 1.0, Rn concentration might by overestimated by about 4% by using a single Rn monitor, however a ratio of about 100 could modify results by a factor of 10. On the other hand, a ratio below 0.8 could not modify the Rn results.…”

Section: Resultsmentioning

confidence: 99%

“…In the past, Rn studies were more common than those of Tn, but recent studies in Serbian [1–3], Chinese [4, 5], Indian [6] Canadian [7–9], Japanese [10], Korean [11, 12], Hungarian [13], Slovenian [14], Irish [15, 16] and USA [17] dwellings have show that Tn can be a significant contributor to the radiation exposure. The contributions of Rn and Tn and its progeny (TnP) to radiation exposure are quite different.…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of radon, thoron and thoron progeny concentration measurements

Janik¹,

Tokonami²,

Kranrod³

et al. 2013

Journal of Radiation Research

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This study examined correlations between radon, thoron and thoron progeny concentrations based on surveys conducted in several different countries. For this purpose, passive detectors developed or modified by the National Institute of Radiological Sciences (NIRS) were used. Radon and thoron concentrations were measured using passive discriminative radon-thoron detectors. Thoron progeny measurements were conducted using the NIRS-modified detector, originally developed by Zhuo and Iida. Weak correlations were found between radon and thoron as well as between thoron and thoron progeny. The statistical evaluation showed that attention should be paid to the thoron equilibrium factor for calculation of thoron progeny concentrations based on thoron measurements. In addition, this evaluation indicated that radon, thoron and thoron progeny were independent parameters, so it would be difficult to estimate the concentration of one from those of the others.

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“…Recently, high 220 Rn concentrations have been reported in areas with granites (Vinay Kumar Reddy et al, 2003;Luo et al, 2005), in earth buildings , and in adobe and brick houses in China (Qiuju et al, 2005). Wide surveys on thoron level have been carried out (Doi et al, 1994;Yonehara et al, 2005;Dwivedi et al, 2005;Sreenath Reddy et al, 2004;Bochicchio et al, 1996;Ramola et al, 2005;Espinosa et al, 2005;Celestina, 2005;Tokonami et al, 2004;Sugino et al, 2005). However, there are still a few data on 220 Rn concentration in dwellings of Korea.…”

Section: Introductionmentioning

confidence: 99%

220Rn and its progeny in dwellings of Korea

Kim

Lee

et al. 2007

Radiation Measurements

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Radon and thoron concentrations in offices and dwellings of the Gunma prefecture, Japan

Cited by 21 publications

References 1 publication

Variability of radon and thoron concentration with type of dwellings in a hilly area

Variability of radon and thoron concentration with type of dwellings in a hilly area

Comparative analysis of radon, thoron and thoron progeny concentration measurements

220Rn and its progeny in dwellings of Korea

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