Investigation of radionuclide levels and estimation for real emanated radon in rock samples collected from Sinai-Egypt

In this work, the distributions of radionuclides activity as well as radon concentrations in selected rock samples collected from Sinai-Egypt were investigated. Radionuclides distribution, 238 U, 232 Th and 40 K, in rock samples, which were gathered from Um-Bogma region, was calculated by HPGe detector. Also radon concentration has been measured by using (SSNTD) CR-39. Using empirical equations, the concentration of 222 Rn emitted ( 226 Ra decaying) was computed and compared to the tracks recorded by CR-39. From our data, the average specific activity in Bq kg −1 for 238 U, 235 U, 234 U, 226 Ra 232 Th and 40 K were obtained. Measured radon concentrations as generated alpha tracks owing to 222 Rn m (measured radon) were compared to occurring 222 Rn p (predicted radon) as 226 Ra alpha decay to determine measured radon loss in natural samples taken from Sinai, Egypt. The geological structure appears to be the main factor affect on detected radon concentration and results shows that radon emanation was influenced by the rock type.