Abstract
The rapid increase in the use of all kinds of ionizing radiation has stimulated research on radiation-induced health risks to man from small exposures. In this context, radioactivity from building materials and radiation prevailing inside dwellings has become of great interest. The paper reports an investigation in which bare cellulose nitrate films (Kodak LR-115, type II) have been used as detectors in a survey to determine the average value of exposure to radon and radon daughters in dwellings in Algiers. To the best of our knowledge no such survey has yet been conducted in the region of northern Africa. In our investigation, the exposure periods varied between 30 and 60 days; in some cases two detectors were exposed side by side to check reproducibility. Following the exposure, the films were chemically etched and microscopically read. Yearly average levels have been estimated, and seasonal variations are observed. The measured levels are found to be very much lower than those observed in several European countries where severe energy-saving measures necessitate the closure of ventillation outlets.
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