Results and Discussion Specific activity of the samples adopted on the Lead isotope (Pb-214) at energies (295.21 and 351.92) keV and Bismuth (Bi-214) at energy (609.32 keV) the specific activity adopted on the Lead isotope (Pb-212), Thallium (Tl-208) and Actinium are equivalent to the specific activity of Uranium (U-238) by choosing the avearge value of their activities, While (Ac-228) at energies (238.63, 583.19 and 911.16) keV respectively, are equivalent to the specific activity of Thorium (Th-232) by choosing the avearge value of their activities
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