Seasonal and diurnal variations of radon/thoron exhalation rate in Kanto-loam area in Japan

Prasad, Ganesh; Ishikawa, Tetsuo; Hosoda, Masahiro; Sahoo, Sarat Kumar; Kávási, Norbert; Tokonami, Shinji; Sugino, Masato; Uchida, Shigeo

doi:10.1007/s10967-012-1620-6

Cited by 22 publications

(12 citation statements)

References 20 publications

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“…The homogeneity of the inner air was ensured by a small size 12 V DC ventilator, which was placed inside the chamber. The chamber volume was more than ten times higher than the sample volume to avoid the back diffusion of radon into the sample pores (Tuccimei et al 2006;Prasad et al 2012;Cosma et al 2001). …”

Section: Determination Of Exhalation Rate and Emanation Factormentioning

confidence: 99%

“…For this reason, the determination of Ra-226 content is not sufficient for characterizing the raw material, since radon emanation and the exhalation greatly depends on internal structure changes occurring as a result of the applied processing technique (Kovács et al 2012;López-Coto et al 2009;Tuccimei et al 2006;Prasad et al 2012;Cosma et al 2001;Sas et al 2012). Several studies have dealt with the usability of red mud in the building material industry in terms of thermal behaviour (Zhang et al 2011;Sglavo et al 2000aSglavo et al , 2000bPontikes et al 2007Pontikes et al , 2009Yao et al 2013).…”

Section: Introductionmentioning

confidence: 99%

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Influencing effect of heat-treatment on radon emanation and exhalation characteristic of red mud

Sas

Szántó

Kovács

et al. 2015

Journal of Environmental Radioactivity

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The reuse of industrial by-products is important for members of numerous industrial sectors. However, though the benefits of reuse are evident from an economical point of view, some compounds in these materials can have a negative effect on users' health.In this study, the radon emanation and exhalation features of red mud were surveyed using heattreatment (100 to 1200°C). As a result of the 1200°C-treated samples, massic radon exhalation capacity reduced from 75 ± 10 mBq kg -1 h -1 to 7 ± 4 mBq kg -1 h -1 , approximately 10% of the initial exhalation rate.To find an explanation for internal structural changes, the porosity features of the heat-treated samples were also investigated. It was found that the cumulative pore volume reduced significantly in less than 100 nm, which can explain the reduced massic exhalation capacity in the high temperature treated range mentioned above.SEM snapshots were taken of the surfaces of the samples as visual evidence for superficial morphological changes. It was found that the surface of the high temperature treated samples had changed, proving the decrement of open pores on the surface.

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Section: Determination Of Exhalation Rate and Emanation Factormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influencing effect of heat-treatment on radon emanation and exhalation characteristic of red mud

Sas

Szántó

Kovács

et al. 2015

Journal of Environmental Radioactivity

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“…The discrepancies in these studies are probably caused by the radium content in the soil sample and the lithology of the area from where the samples were collected. 12 It is also important to state that the mean area radon exhalation rates observed in the present study are well below the world average 2 of 118.8 Bqm −2 h −1 and hence do not pose any health hazards to the residents.…”

Section: Resultsmentioning

confidence: 48%

“…10 The range of recoil distance for radon is 20–70 nm in common minerals, 100 nm in water and 63 nm in air. 12 After emanation processes, radon atoms entering into the pore spaces are transported by diffusion and advection through this space. Radon atoms transport within the soil, until they undergo radioactive decay or are released into the atmosphere.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of the radon exhalation rate and effective radium concentration in soil samples of southern Sakarya, Turkey

Tabar

Yakut

Kuş

2016

Indoor and Built Environment

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In the present study, radon exhalation rates in terms of mass and area, as well as the effective radium concentration in soil samples collected simultaneously from different districts of southern Sakarya have been measured by Sealed Can technique using LR-115 type-II detectors. Mass and areal radon exhalation rates in soil samples vary from 35.76 ± 1.5 to 253.15 ± 3.8 mBqkg−1h−1 with an average value of 112.53 ± 2.7 mBqkg−1h−1 and 0.73 ± 0.2 to 5.18 ± 0.6 Bqm−2h−1 with an average value of 2.30 ± 0.6 Bqm−2h−1, respectively. The effective radium content was found to vary in the range 3.77 ± 0.5 to 26.69 ± 1.3 Bqkg−1 with an average value of 11.86 ± 0.9 Bqkg−1. The area exhalation rate was also used to calculate indoor radon concentration contributed by radon exhalation from soil, and to estimate annual effective dose equivalent. While the indoor radon concentration contributed by radon exhalation from soil varies from 2.93 ± 0.9 to 20.73 ± 2.3 Bqm−3 with an average value of 9.22 ± 1.5 Bqm−3, the estimated effective dose equivalent varies from 0.09 to 0.61 mSvy−1 with an average value of 0.27 mSvy−1.

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Radon and thoron exhalation rate in the soil of Western Haryana, India

Rani

Kundu

Garg

et al. 2023

Environ Monit Assess

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This study, reports the exhalation rates of radon and thoron from surface soil collected from 60 rural sites of district Hisar, Haryana, India. The exhalation rates of Rn 222 (Radon)& Rn 220 (Thoron) were measured by portable SMART RnDuo (AQTEK SYSTEMS) using a mass accumulation chamber which is equipped with a scintillation material coated cell. Dose rate due to Natural gamma radiations ranged 0.526 to 1.139 mSv y − 1 . The Rn 222 mass exhalation rate in soil samples varied from 0.14 to 94.65 mBq kg − 1 h − 1 . Thoron surface exhalation rates ranged 46.42 to 619.88 mBq m − 2 h − 1 . This study give an idea about the differences in Rn 222 & Rn 220 exhalation at different locations which may be due to variations in geological structure of the locations and characteristics of the top soil.The ndings show that using soil of the study area as building material is safe.

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Seasonal and diurnal variations of radon/thoron exhalation rate in Kanto-loam area in Japan

Cited by 22 publications

References 20 publications

Influencing effect of heat-treatment on radon emanation and exhalation characteristic of red mud

Influencing effect of heat-treatment on radon emanation and exhalation characteristic of red mud

Measurement of the radon exhalation rate and effective radium concentration in soil samples of southern Sakarya, Turkey

Radon and thoron exhalation rate in the soil of Western Haryana, India

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