Size distribution, equilibrium ratio and unattached fraction of radon decay products under typical indoor domestic conditions

Huet, C.; Tymen, G.; Boulaud, D.

doi:10.1016/s0048-9697(01)00671-4

Cited by 26 publications

(27 citation statements)

References 7 publications

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“…The present AMTD (1.25 nm) is considered to be relatively higher than the values obtained (around 0.8 nm) by Huet et al (11) and VauPotic & Kobal (13) .…”

Section: Indoor Activity Size Distribution Ofcontrasting

confidence: 77%

“…This distribution has been determined by tagging natural aerosol particles with radon progeny. However, some measurements for attached and unattached activity size distributions of 222 Rn progeny have been performed in the indoor air under realistic natural conditions (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17) . Most of the observed data have shown that the size distribution of radon progeny consists of ultrafine clusters with median diameters below 4 nm (unattached activity) and progenies associated with ambient aerosol particles in sizes ranging between 100 and 1000 nm (attached activity).…”

mentioning

confidence: 99%

“…The amount of unattached activities up to about 10 percent of the total activity in the air, but is considered to yield about 50 percent of the total radiation dose (9,14,20) . Therefore, it is necessary to determine the size of the unattached fraction of radon progeny (7,11,13,18,21) .…”

mentioning

confidence: 99%

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Lung Depth Dose from Inhalation of 222Rn Progeny

2012

Egypt. J. Biophys. Biomed. Engng.

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N THE CASE of internally deposited radionuclides, direct ……measurement of the energy absorbed from ionizing radiation emitted by the decaying of these radionuclides is rarely, if ever, possible. Therefore, one must rely on dosimetric models to obtain estimates of the spatial and temporal patterns of energy deposition in human lung. These models always require information about the parameters of activity size distributions of radon progeny. In the present work, the attached and unattached activity size distribution of 222 Rn progeny ( 214 Bi and 214 Po) were measured in indoor air of Minia University, Minia, Egypt. The attached fraction was collected using a low-pressure Berner cascade-impactor technique. A constructed wire screen diffusion battery was used for collecting the unattached fraction. Most of the attached activities for 214 Bi progeny were associated with the aerosol particles of the accumulation mode. The AMAD of this mode for 214 Bi was determined to be 350 nm with GSD of 3. The GSD of unattached size distributions for 214 Po is 1.29 with AMTD of 1.25 nm. An analytical method has been developed to compute the local energy deposition of 214 Po alpha particles in a target volume of 1 m spheres located at different depths in bronchial epithelium. In order to reach the target, alpha particles travel either through tissue alone or through air and tissue. While the depth-dose distributions in the case of nuclides uniformly distributed within the epithelium were practically constant with depth, they decreased in an almost linear fashion with increasing depth in the case of nuclides on the airway surface.

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“…The present AMTD (1.25 nm) is considered to be relatively higher than the values obtained (around 0.8 nm) by Huet et al (11) and VauPotic & Kobal (13) .…”

Section: Indoor Activity Size Distribution Ofcontrasting

confidence: 77%

mentioning

confidence: 99%

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Lung Depth Dose from Inhalation of 222Rn Progeny

2012

Egypt. J. Biophys. Biomed. Engng.

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“…Under these conditions the annual effective dose can increase by a factor of four for the same original radon concentration, because of different aerosol condition indoors (Chavez et al, 2003). A strong effect of the size and concentration of aerosol particles on typical indoor domestic exposure to radon was also reported by Huet, Tymen, & Boulard, (2001). The equilibrium factor and total solid particles follow the same pattern, F increases with increasing aerosol particle concentrations (Martinez et al, 2000).…”

Section: Discussionmentioning

confidence: 97%

Environmental radon studies in Mexico

Segovia

Gaso²,

Armienta

2007

Environ Geochem Health

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Radon has been determined in soil, groundwater, and air in Mexico, both indoors and outdoors, as part of geophysical studies and to estimate effective doses as a result of radon exposure. Detection of radon has mainly been performed with solid-state nuclear track detectors (SSNTD) and, occasionally, with active detection devices based on silicon detectors or ionization chambers. The liquid scintillation technique, also, has been used for determination of radon in groundwater. The adjusted geometric mean indoor radon concentration (74 Bq m-3) in urban developments, for example Mexico City, is higher than the worldwide median concentration of radon in dwellings. In some regions, particularly hilly regions of Mexico where air pollution is high, radon concentrations are higher than action levels and the effective dose for the general population has increased. Higher soil radon levels have been found in the uranium mining areas in the northern part of the country. Groundwater radon levels are, in general, low. Soil-air radon contributing to indoor atmospheres and air pollution is the main source of increased exposure of the population.

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“…Therefore, for a correct estimate of the human radiation exposure, it is necessary to determine the unattached fraction under realistic living conditions. Other observations of unattached fraction of 222 Rn decay products in indoor air (Shimo and Ikebe, 1984;Reineking et al, 1985;Porstendo¨rfer et al, 1987;George and Breslin, 1978;Strong, 1988;Kojima and Abe, 1988;Reineking and Porstendo¨rfer, 1990;Porstendo¨rfer and Reineking, 1992;Porstendo¨rfer, 1994Porstendo¨rfer, , 1996Porstendo¨rfer, , 2001Yu et al, 1996;Porstendo¨rfer and Reineking, 1999;Piotr and Anthony, 2000;Huet et al, 2001) show different f p values in the range from 0.04 up to 0.2. These discrepancies between the f p values given by the ICRP and the other authors can be traced back to some factors.…”

Section: Introductionmentioning

confidence: 93%

A study on natural radiation exposure in different realistic living rooms

El-Hussein¹

2005

Journal of Environmental Radioactivity

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Size distribution, equilibrium ratio and unattached fraction of radon decay products under typical indoor domestic conditions

Cited by 26 publications

References 7 publications

Lung Depth Dose from Inhalation of 222Rn Progeny

Lung Depth Dose from Inhalation of 222Rn Progeny

Environmental radon studies in Mexico

A study on natural radiation exposure in different realistic living rooms

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