Several radionuclides of the 238 U (or its decay daughters such as 234 Pa, 234 U, 230 Th, 226 Ra, 214 Pb, and 214 Bi), 232 Th ( 228 Ac, 208 Tl, and 212 Bi), and 235 U decay series have been measured. The 234 U/ 238 U activity ratios (ARs) are >1 for most rock samples indicating preferential abundance of 234 U relative to 238 U from the rock due to prevailing reducing conditions. The 226 Ra/ 238 U ratios are ranging between 0.04 and 0.6 and averaging 0.4 which show disequilibrium in the direction of uranium concentrations. 230 Th/ 238 U and 230 Th/ 234 U ARs for all studied samples are less than unity, suggesting that all 230 Th are produced by in situ decay of 234 U and there is no allogeneic or initial 230 Th. Exposure rate, dose rate, radium equivalent activity, external hazard index, internal hazard index, and radioactivity level index are determined.