222Rn, 220Rn and Their Progenies Measured in the Air of Different Dwellings and Workplaces and Resulting Alpha Radiation Doses to the Eyes of Individuals

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Abstract

In order to assess radiation doses to the eyes of individuals, concentrations of 222Rn, 220Rn and their decay products were measured in different dwelling rooms, café rooms and vehicle repair shops by using two different types of solid state nuclear track detectors (SSNTDs). The influence of building materials, pollution and ventilation rate on radon and thoron alpha-activities inside the studied locations has been investigated. A new dosimetric model was developed for evaluating radiation doses to the eyes of individuals due to alpha particles emitted by the radon and thoron series in the air of the studied dwelling rooms, café rooms, and vehicle repair shops. The influence of the radon and thoron activities in the air of the studied locations, as well as exposure time on committed equivalent dose to the eyes of individuals, was investigated. A maximum value of the committed equivalent dose to the eyes of individuals due to alpha particles emitted by the radon and thoron series was found equal to 0.1 mSv y−1 cm−2. Committed equivalent dose to the eyes of individuals due to the diffusion of the 222Rn and 220Rn gases present in ambient air of the studied locations has been evaluated.

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