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The main naturally occurring radioactive isotopes in water are uranium isotopes, radium isotopes, and radon isotopes, these radionuclides are mainly soluble in water [3]. The production of these radionuclides in groundwater is mainly from rockwater interactions. The levels of radioactivity in groundwater depends on many factors such as the concentrations of these radionuclides in the aquifer rocks, geomorphology, and lithology other ecological conditions of aquifer [4,5], depending also on chemical reactions and the physical processes of decay along the water-rock interface. 226Ra is an alpha emitter with longest a half-life of 1602yr, it originates from the 238U decay series and its descendant 222Rn has a half-life of 3.8d. 228Ra is a beta emitter with a halflife of 5.75yr and it originates from 232Th series. 40K is also radioactive and has a half-life of 1.3x 109yr. Generally, radium concentrations in surface water range from 0.01 to 0.1Bql1 [6], while its concentration in groundwater can reach values up to 38Bql-1, depending on the factors mentioned previously. 222Rn is produced which is a gaseous radioisotope and diffuses into the pore water of rock formation. The 222Rn concentration in groundwater reaches to 183Bql-1 [7]. The recommended reference level of radon concentration in tap water is 150Bql-1 as considered by [8].

Spatial Distribution of the Natural Radioactivity of the Water and its Association with the Physico-Chemical Parameters: Abu Tig, Assiut, Egypt