Results 151 to 160 of about 716 (178)
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Journal of the Air & Waste Management Association, 1990
Thoron (220Rn), an isotope of the radon family, is produced in the earth’s crust at a rate comparable to that of common radon (222Rn). Thoron’s average activity concentration in soil gas and ground-level outside air is comparable to that of radon. Recent data from Europe and the United States indicate that in terms of the energy of the alpha particle ...
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Thoron (220Rn), an isotope of the radon family, is produced in the earth’s crust at a rate comparable to that of common radon (222Rn). Thoron’s average activity concentration in soil gas and ground-level outside air is comparable to that of radon. Recent data from Europe and the United States indicate that in terms of the energy of the alpha particle ...
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Comparative dosimetry of radon and thoron
Radiation Protection Dosimetry, 2010There is a well-known discrepancy between dosimetrically derived dose conversion factor (DCF) and epidemiologically derived DCF for radon. As the latter DCFs, International Commission on Radiological Protection (ICRP) recommends a value of ∼6.4 nSv (Bq h m(-3))(-1) and 7.9 nSv (Bq h m(-3))(-1) for radon decay products (RnDP) in dwellings and workplaces,
C, Kranrod +5 more
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Neutralization of Thoron Progeny in Gases
Health Physics, 1994This paper reports charge neutralization phenomena of 212Pb particles in nitrogen or oxygen atmospheres with trace amounts of other gases. Newly produced thoron or radon progeny are positively charged, stable molecular clusters that are subsequently neutralized by several mechanisms.
Y S, Cheng +3 more
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Radiation Protection Dosimetry, 2015
Long-term measurements of thoron progeny concentrations (equilibrium-equivalent thoron concentration) have been carried out in Swedish dwellings with the aim of investigating if thoron and its progeny pose a health risk. Measurements were performed in 93 houses and 25 apartments.
K, Skeppström, E, Wåhlin
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Long-term measurements of thoron progeny concentrations (equilibrium-equivalent thoron concentration) have been carried out in Swedish dwellings with the aim of investigating if thoron and its progeny pose a health risk. Measurements were performed in 93 houses and 25 apartments.
K, Skeppström, E, Wåhlin
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Radiation Protection Dosimetry, 2010
Intercomparisons of radon/thoron detectors play an important role not only for domestic radon/thoron survey but also for international or interregional discussion about radon/thoron mapping in dwellings as well as that in the soil. For these purposes, it is necessary to improve and standardise technical methods of measurement and to verify quality ...
M, Janik +5 more
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Intercomparisons of radon/thoron detectors play an important role not only for domestic radon/thoron survey but also for international or interregional discussion about radon/thoron mapping in dwellings as well as that in the soil. For these purposes, it is necessary to improve and standardise technical methods of measurement and to verify quality ...
M, Janik +5 more
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Radiation Protection Dosimetry, 1983
Revue des facteurs physiques determinant les niveaux de radon et de thoron dans les bâtiments, incluant les sources, le taux de ventilation et la concentration en aerosols naturels.
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Revue des facteurs physiques determinant les niveaux de radon et de thoron dans les bâtiments, incluant les sources, le taux de ventilation et la concentration en aerosols naturels.
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Journal of Inorganic and Nuclear Chemistry, 1966
Abstract The half-lives of thoron and actinon have been redetermined using a detector which depends on charcoal particle adsorption of the gas and measurement of the α-particles by scintillation screen, photomultiplier techniques. The new value for thoron half-life is 55·61 ± 0·04 sec, and the new value for actinon is 3·96 ± 0·01 sec.
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Abstract The half-lives of thoron and actinon have been redetermined using a detector which depends on charcoal particle adsorption of the gas and measurement of the α-particles by scintillation screen, photomultiplier techniques. The new value for thoron half-life is 55·61 ± 0·04 sec, and the new value for actinon is 3·96 ± 0·01 sec.
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Measurements of Thoron and Thoron Progeny Indoors in Sweden
Radiation Protection Dosimetry, 1992L. Mjönes +3 more
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Characteristics of Thoron (220Rn) and Its Progeny in the Indoor Environment
International Journal of Environmental Research and Public Health, 2020Shinji Tokonami, Tokonami Shinji
exaly