Radon and thoron radiation exposure of the Angolan population living in adobe houses

Salupeto-Dembo, Judith; Szabó-Krausz, Zsuzsanna; Völgyesi, Péter; Szabó, Csaba

doi:10.1007/s10967-020-07215-4

Cited by 4 publications

(2 citation statements)

References 31 publications

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“…Few surveys of measuring thoron in dwellings are available worldwide and very few data are available from Africa. Salupeto-Dembo et al [3] reported radon and thoron radiation exposure in the Angolan population living in adobe houses. Chege et al [4] studied radon and thoron in earthen houses in rural Kenya.…”

Section: Jrprmentioning

confidence: 99%

“…Track densities (NTnP) from the selective monitor for thoron decay products allow estimation of the equilibrium equivalent thoron concentration (EETC) from the following equation: (3) where NB2 is the background track density of CR-39 in the thoron progeny deposition detectors, T is the exposure time, and F TnP is the conversion factor for the thoron progeny deposition detector. From the results of a field survey [19] and the chemical etching conditions, the valuee of F TnP was 6.9 × 10 -2 tracks/cm 2 per Bq/m 3 /hr.…”

Section: Thoron Progeny Monitorsmentioning

confidence: 99%

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From Radon and Thoron Measurements, Inhalation Dose Assessment to National Regulation and Radon Action Plan in Cameroon

Saïdou¹,

Tokonami

Hosoda

et al. 2022

J Radiat Prot Res

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Background: The current study reports measurements of activity concentrations of radon (222Rn) and thoron (220Rn) in dwellings, followed by inhalation dose assessment of the public, and then by the development of regulation and the national radon action plan (NRAP) in Cameroon.Materials and Methods: Radon, thoron, and thoron progeny measurements were carried out from 2014 to 2017 using radon-thoron discriminative detectors (commercially RADUET) in 450 dwellings and thoron progeny monitors in 350 dwellings. From 2019 to 2020, radon track detectors (commercially RADTRAK) were deployed in 1,400 dwellings. It was found that activity concentrations of radon range in 1,850 houses from 10 to 2,620 Bq/m3 with a geometric mean of 76 Bq/m3.Results and Discussion: Activity concentrations of thoron range from 20 to 700 Bq/m3 with a geometric mean of 107 Bq/m3. Thoron equilibrium factor ranges from 0.01 to 0.6, with an arithmetic mean of 0.09 that is higher than the default value of 0.02 given by UNSCEAR. On average, 49%, 9%, and 2% of all surveyed houses have radon concentrations above 100, 200, and 300 Bq/m3, respectively. The average contribution of thoron to the inhalation dose due to radon and thoron exposure is about 40%. Thus, thoron cannot be neglected in dose assessment to avoid biased results in radio-epidemiological studies. Only radon was considered in the drafted regulation and in the NRAP adopted in October 2020. Reference levels of 300 Bq/m3 and 1,000 Bq/m3 were recommended for dwellings and workplaces.Conclusion: Priority actions for the coming years include the following: radon risk mapping, promotion of a protection policy against radon in buildings, integration of the radon prevention and mitigation into the training of construction specialists, mitigation of dwellings and workplaces with high radon levels, increased public awareness of the health risks associated with radon, and development of programs on the scientific and technical aspects.

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Section: Jrprmentioning

confidence: 99%

Section: Thoron Progeny Monitorsmentioning

confidence: 99%