دراسة معامل التوهين الخطي و الكتلي لأشعة كاما لبعض مواد البناء المستخدمة في العراق

الملخص EN

In this research, the photons of gamma rays emitted from radioactive sources (133 Ba, 137Cs,60Co) at energies (81, 356, 662, 1173, 1332) keV respectively have been used to examine the linear and the mass attenuation coefficient of different construction materials using gamma spectrometer UCS-20 which is connected with sodium Iodide activated thallium detector (NaI(Tl)) to express the decrease in the intensity of these photons when they pass through the targeted material by scintillation detector reading.

According to the results obtained, it becomes possible to measure the two types of attenuation coefficients, the linear and the mass, as these coefficients are of great importance in studying the impact of these rays on the material and the accounts of the radiation dose in order to achieve the level of security against exposure to radiation and to prevent the dangers resulting from that exposure by designing suitable shields.

The chemical composition of the material under discussion has also been studied using the technique of X-rays fluorescence (XRF) by (XRF) device and the results were put in the program (XCOM) to compare the values of attenuation coefficients.

Results have shown that (Granite) is one of the best building materials to be used in shielding against gamma rays, whereas the (Thermostone) showed lessability to attenuation because of its too low density and the little concentration of elements of high atomic number of this Material.