Radon-222 Concentrations and Decay-product Equilibrium in Dwellings and in the Open Air

Keller, G.; Folkerts, Kerstin

doi:10.1097/00004032-198409000-00004

Cited by 32 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The equilibrium factor (F) varied between 0.22 and 0.52 with an average value of 0.34±0.02. In German buildings, a similar value (F = 0.33) had been measured by Keller and Folkerts (1984). Also, the present value showed a quite good agreement with the observed value in Indian dwellings where a mean value of F = 0.35 was determined (Khan 2000).…”

Section: Resultssupporting

confidence: 90%

Unattached fractions and aerosol attached of radon progeny in indoor air

Mohery¹

2012

Int. J. Phys. Sci.

View full text Add to dashboard Cite

The present study summarizes the experimental data on the activity concentrations of 222 Rn gas (i C 0), unattached (if C 1 , if C 2) and attached (ia C 1 , ia C 2 , ia C 3) short-lived 222 Rn progeny 218 Po, 214 Pb and 214 Po in indoor air of Jeddah City, K.S.A. Jeddah city lies on the eastern bank of the red sea, South West the Kingdom of Saudi Arabia. The city is located between latitudes 21° 27 \ and 21° 30 \ N, longitudes 39° 9 \ and 31° 12 \ E. By means of theoretical model calculation, the unattached fraction (f P) of 218 Po, 214 Pb of potential alpha energy of 222 Rn progeny, the equilibrium factor (F), the attachment rate (X) to aerosol particles in the room air, the attachment coefficient (B) and the deposition rates of unattached (q f) and attached (q a) of 222 Rn progeny on walls and other surfaces were calculated. The measurements were performed at different days in three different rooms of same size at low and moderate ventilation rates. An electrostatic precipitation method and a single wire-screen diffusion battery technique were both employed for the determination of 222 Rn gas concentration and its unattached progeny, respectively. At low ventilation rate (υ ≤ 0.4 h-1) a mean unattached fraction (f P) of 0.096±0.01 was obtained at a mean aerosol particle concentration (Z) of 2.6×10 3 cm-3 and at a mean equilibrium factor (F) of 0.34 ± 0.02. The mean deposition rates of unattached (q f) and attached (q a) 222 Rn progeny were found to be 94±13 h-1 and 0.12±0.05 h-1 , respectively. The values of the recoil factor were neglected. At moderate ventilation rate of υ = 0.5 h-1 a mean value of f P = 0.059±0.006 was obtained at a mean aerosol concentration Z = 29×10 3 cm-3 and at a mean F =0.24±0.014. In this case the mean value of the recoil factor was found to be 0.54±0.18.

show abstract

Section: Resultssupporting

confidence: 90%

Unattached fractions and aerosol attached of radon progeny in indoor air

Mohery¹

2012

Int. J. Phys. Sci.

View full text Add to dashboard Cite

show abstract

“…However, at higher values of aerosol particle concentrations, no equilibrium (F Z 1) is reached because a certain fraction of attached aerosol particles is always lost by the deposition on walls and furniture. In German buildings, a similar value (F Z 0.33) had been measured by Keller and Folkerts (1984). Also, the present value showed a quite good agreement with the observed value in Indian dwellings (Khan, 2000) where a mean value of F Z 0.35 was determined.…”

Section: Resultssupporting

confidence: 90%

A study on natural radiation exposure in different realistic living rooms

El-Hussein¹

2005

Journal of Environmental Radioactivity

View full text Add to dashboard Cite

“…There is a wide range of values reported for F from individual outdoor measurements, ranging from about 0.1 to 1.0 (see e.g. [3,4]). A theoretical approach of the vertical equilibrium distribution of radon and its decay products was provided by Jacobi and André [5], however, as stated by UNSCEAR [6], there is a degree of uncertainty in the application of a typical value to derive dose estimates from radon concentration measurements.…”

Section: Introductionmentioning

confidence: 99%

Diurnal and seasonal variation of the equilibrium state between short-lived radon decay products and radon gas in ground-level air

Winkler¹,

Ruckerbauer²,

Trautmannsheimer³

et al. 2001

Radiation and Environmental Biophysics

View full text Add to dashboard Cite

To study seasonal and diurnal variations and the effect of meteorological parameters, the equilibrium factor F (i.e. the ratio of equilibrium equivalent radon daughter concentration and radon gas concentration) was determined as a result of measurements on a test field at Munich-Neuherberg, Germany, continuously from October 1995 through March 1997. On average, F was found to be 0.62+/-0.09 (95% confidence level). The time series of F showed no distinct seasonal variations. Nevertheless, typical diurnal variations as well as seasonal variations of the diurnal behaviour were observed. Generally, F was found to be increased in the early afternoon, i.e. under conditions of enhanced vertical mixing in the atmosphere. The daily differences between high and low values of F depended on the season. On average, low F values were characteristic for days with precipitation and high wind speed, i.e. under turbulent atmospheric conditions. Therefore, taking daily mean values into account, F was found to be positively correlated with the aerosol concentration, although a relationship between the diurnal behaviour of the aerosol concentration and that of F was not detectable.

show abstract

Radon-222 Concentrations and Decay-product Equilibrium in Dwellings and in the Open Air

Cited by 32 publications

References 0 publications

Unattached fractions and aerosol attached of radon progeny in indoor air

Unattached fractions and aerosol attached of radon progeny in indoor air

A study on natural radiation exposure in different realistic living rooms

Diurnal and seasonal variation of the equilibrium state between short-lived radon decay products and radon gas in ground-level air

Contact Info

Product

Resources

About