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Natural radioactivity in raw materials used in building industry in Serbia
Todorovic, N.; Bikit, I.; Krmar, M.; Mrdja, D.; Hansman, J.; Nikolov, J.; Forkapic, S.; Veskovic, M.; Bikit, K. & Jakonic, L.
Abstract
Natural radioactivity is responsible for most of
the total radiation dose received by human population.
Geological materials used in building industry usually
become contaminated with naturally occurring radioactive
materials. They are used as mixtures in building industry
(kaolin, zircon, frit, feldspar) or mechanically processed
and used for covering floors and walls of the rooms (granite).
In this paper, activity concentrations of 226Ra, 232Th
and 40K in 6 kaolin, 11 zircon, 18 granite, 3 marble, 6 sand,
4 perlite, 4 feldspar, 5 korund and 1 frit samples imported in
Serbia were determined by gamma-ray spectrometry.
Activity concentration index, dose rate and annual effective
dose were calculated for each of the investigated samples.
Measurement of an external gamma dose rate by using a
commonly available radiation survey meter can give some
indication of the need for further investigations. The
absorbed dose rate and annual effective doses for workers in
the ceramic industry "Keramika Kanjiza Plus" in Serbia
working with granite are determined.
Keywords
Natural radioactivity; Gamma spectrometry; Activity concentration index; Annual effective dose
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