Abstract
Detection efficiencies of CR-39 and LR-115 type II solid state nuclear track detectors (SSNTDs) for α-particles emitted by the nuclei of uranium and thorium series inside different natural materials were calculated by using a new Monte Carlo computer code. Variation of these detection efficiencies as a function of initial α-particles energies was investigated. Uranium and thorium contents have been determined in the studied samples by exploiting the data obtained for detection efficiencies of the SSNTD, utilized for α-particles from uranium and thorium families and measuring the resulting track densities. Data obtained were compared with those obtained by using other methods.
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