الخلاصة:
The natural radioactivity is omnipresent everywhere in the Earth’s crust. The
ground is not composed solely of organic and inorganic matter, but also radio nuclide like
uranium, thorium, radium and potassium-40.These elements occur in nature as complex
oxides, carbonates, phosphates, sulfates and silicates. The concentration of natural
radioactive elements depends on the type of soil. The technique used to measure the low
activity of natural radioactive elements is the gamma spectrometry with a hyper pure
germanium detector(HPGe). This technique is best suited for the identification and
quantification of different radionuclide in a sample. In this work, we present the results of
measurement of specific activity in a set of samples taken from different sites in Southern
Algeria: Sand MRAR, ,andAdrar,.The results show that radioactivity in the phosphate and the
three samples are comparable to what is usually measured in the same samples worldwide
and that this radioactivity does in no way a health risk to the public. Some long-term adverse
effects can be avoided by simple precautionary measure
