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Radon progeny: Behaviour and influencing factors in indoor and outdoor environment.

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Title: Radon progeny: Behaviour and influencing factors in indoor and outdoor environment.
Authors: Mishra, Rosaline1,2 (AUTHOR) rosaline@barc.gov.in, Rout, R.P.1 (AUTHOR), Prajith, R.1 (AUTHOR), S, Jalaluddin1 (AUTHOR), Khan, A.1 (AUTHOR), Sapra, B.K.1,2 (AUTHOR)
Source: Applied Radiation & Isotopes. Jun2025, Vol. 220, pN.PAG-N.PAG. 1p.
Subjects: Summer, Background radiation, Radiation sources, Radon, Rainfall, Soil air
Abstract: Radon progeny are the major contributor to inhalation dose to humans from natural sources of radiation. In addition, they are also used as tracers to study atmospheric phenomena. This makes it important to study the behaviour of Radon Progeny in both indoor and outdoor environment. In the present study, the progeny concentration, Radon gas concentration, unattached fraction are continuously measured for a period of 1 year in a ground floor room in Mumbai, both indoor and outdoor. The hourly average data for all months gave a clear picture of the diurnal and seasonal variation in progeny activity concentrations, unattached fractions and equilibrium factor in both environments. Average progeny concentration in the indoors was measured as ∼2–3 times higher that in the outdoors. The progeny activity in the outdoor environment was minimum in the rainy season (3.6 ± 1.2 Bq m−3), whereas that in indoors was minimum in summer season (7.5 ± 2.9 Bq m−3). Equilibrium factor in the indoor was obtained as V-shaped behavior with a minima in the afternoon, which was contrary to the inverted V-shaped measured in the outdoors. The night-time and day time variations highlight the influencing factors, like temperature, humidity, rainfall and turbulence. • Continuous measurement of Progeny activity, Unattached fraction and Equilibrium factors in indoor and outdoor environments. • Seasonal dependence of unattached fraction and equilibrium factor. • Diurnal variation of Radon progeny, unattached fraction and equilibrium factor. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Radon progeny are the major contributor to inhalation dose to humans from natural sources of radiation. In addition, they are also used as tracers to study atmospheric phenomena. This makes it important to study the behaviour of Radon Progeny in both indoor and outdoor environment. In the present study, the progeny concentration, Radon gas concentration, unattached fraction are continuously measured for a period of 1 year in a ground floor room in Mumbai, both indoor and outdoor. The hourly average data for all months gave a clear picture of the diurnal and seasonal variation in progeny activity concentrations, unattached fractions and equilibrium factor in both environments. Average progeny concentration in the indoors was measured as ∼2–3 times higher that in the outdoors. The progeny activity in the outdoor environment was minimum in the rainy season (3.6 ± 1.2 Bq m−3), whereas that in indoors was minimum in summer season (7.5 ± 2.9 Bq m−3). Equilibrium factor in the indoor was obtained as V-shaped behavior with a minima in the afternoon, which was contrary to the inverted V-shaped measured in the outdoors. The night-time and day time variations highlight the influencing factors, like temperature, humidity, rainfall and turbulence. • Continuous measurement of Progeny activity, Unattached fraction and Equilibrium factors in indoor and outdoor environments. • Seasonal dependence of unattached fraction and equilibrium factor. • Diurnal variation of Radon progeny, unattached fraction and equilibrium factor. [ABSTRACT FROM AUTHOR]
ISSN:09698043
DOI:10.1016/j.apradiso.2025.111760