Abstract
Uranium and thorium contents in different geological samples were determined by using CR-39 and LR-115 type II solid-state nuclear track detectors (SSNTD) and by calculating the probabilities for α-particles emitted by the uranium and thorium series to reach and be registered on the SSNTD films. A new method has been developed based on the calculation of the self-absorption and transmission coefficients of the γ photons emitted by the uranium or thorium families and by the potassium 40 ( 40K) isotope for evaluating the γ dose rate in the samples. Moreover, the transport of γ photons across parallelepipedic blocks of the geological materials was investigated. Using the results of these studies, the γ dose rates in the atmosphere of different geological deposits were evaluated.
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