Dynamics and direct sensing of radon progeny

Deposition based direct radon and thoron progeny sensors give a more accurate estimate of the inhalation dose due to radon and thoron. The dependence of equilibrium factor on aerosol concentration and the ventilation rates has been studied. Deposited flux represents a better index of inhalation dose. Deposition based sensors are based on deposition velocity of the progeny atoms in the environment which show variability only in extremities like very low aerosol environment or very high ventilation rates, which has been presented in this work. Wire-mesh capped deposition sensor which is based on attached fraction deposition velocity, has been studied at different particle concentrations and it can be used for such occupational environments.