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Published on: May 3, 2019
A comparison of radon and its decay products' behaviour in indoor air
R Trevisi1, F Cardellini2, F Leonardi3
1Department of Occupational Hygiene, INAIL (Italian National Workers Compensation Authority), Research Sector, Monteporzio Catone (Rome) 00040, Italy r.trevisi@inail.it.
Abstract:
The inhalation of short-lived radon decay products (RDP) yields the greatest contribution to the natural radiation exposure. This paper deals with a study carried out to improve the knowledge of the behaviour of RDPs, their interaction with particulates and the plateout during the time. The tests confirmed that a high aerosol particle concentration increases the probability that an ion sticks to aerosol and remains long in the air, leading to both an increase of F and a decrease of fp, as reported in the literature. The same experimental protocol applied in a small radon chamber showed a strong reduction of the equilibrium factor (an average of ∼10 %), because in a small environment the plateout phenomenon prevails on the attachment to particulate.
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