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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]
Copyright of Applied Radiation & Isotopes is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 184174575
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
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  Data: Radon progeny: Behaviour and influencing factors in indoor and outdoor environment.
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  Data: <searchLink fieldCode="AR" term="%22Mishra%2C+Rosaline%22">Mishra, Rosaline</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> rosaline@barc.gov.in</i><br /><searchLink fieldCode="AR" term="%22Rout%2C+R%2EP%2E%22">Rout, R.P.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Prajith%2C+R%2E%22">Prajith, R.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22S%2C+Jalaluddin%22">S, Jalaluddin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Khan%2C+A%2E%22">Khan, A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sapra%2C+B%2EK%2E%22">Sapra, B.K.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Applied+Radiation+%26+Isotopes%22">Applied Radiation & Isotopes</searchLink>. Jun2025, Vol. 220, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Summer%22">Summer</searchLink><br /><searchLink fieldCode="DE" term="%22Background+radiation%22">Background radiation</searchLink><br /><searchLink fieldCode="DE" term="%22Radiation+sources%22">Radiation sources</searchLink><br /><searchLink fieldCode="DE" term="%22Radon%22">Radon</searchLink><br /><searchLink fieldCode="DE" term="%22Rainfall%22">Rainfall</searchLink><br /><searchLink fieldCode="DE" term="%22Soil+air%22">Soil air</searchLink>
– Name: Abstract
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  Data: 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]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Applied Radiation & Isotopes is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.apradiso.2025.111760
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      – Code: eng
        Text: English
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        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Summer
        Type: general
      – SubjectFull: Background radiation
        Type: general
      – SubjectFull: Radiation sources
        Type: general
      – SubjectFull: Radon
        Type: general
      – SubjectFull: Rainfall
        Type: general
      – SubjectFull: Soil air
        Type: general
    Titles:
      – TitleFull: Radon progeny: Behaviour and influencing factors in indoor and outdoor environment.
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            NameFull: Mishra, Rosaline
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            NameFull: Rout, R.P.
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            NameFull: Prajith, R.
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            NameFull: S, Jalaluddin
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            NameFull: Khan, A.
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            – D: 01
              M: 06
              Text: Jun2025
              Type: published
              Y: 2025
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              Value: 09698043
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              Value: 220
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