No abstract

In this study, the dependence of gamma-ray absorption coefficient on the particulate matter sizes of steel slag, iron fillings and steel balls incorporated concrete were examined. The contents of these fillers in concrete mix was kept constant to 35 wt. %. Only the filler particle size was varied during the tests. The particle size ranged from 0.2mm to 1mm for steel slags and the iron fillings and from 2.5mm to 10mm for the steel balls.The concrete samples were assessed for their anti-radiation attenuation coefficient properties. The attenuation measurements were performed using gamma spectrometer of NaI (Tl) detector. The utilized radiation source was Cs137 radioactive element with photon energy of o.662 MeV. The results showed that gamma-ray attenuation coefficient was inversely proportional to the filler particulate matter size. Likewise the mean free paths for the tested samples were obtained. Maximum linear attenuation coefficient of 1.102±0.263cm-1 was attained for the iron filling.The iron balls and the steel slags showed much inferior values. The concrete incorporates iron filings afforded the best shielding effect. The density, microstructure, homogeneity and particulate distribution of the concrete samples were examined and evaluated using different metallographic, microscopic and measurement facilities.

Samples of concrete incorporate different waste materials such as iron filings, iron balls of used ball bearings and slags from steel industry were assessed for their anti-radiation attenuation coefficient properties. The attenuation measurements were performed using gamma spectrometer of NaI (Tl) detector. The utilized radiation sources comprised Cs137and Co60radioactive elements with photon energies of o.662 MeV for Cs137and two1.17 and 1.33 MeV energy levels for the Co60. Likewise the mean free paths for the tested samples were obtained. The maximum linear attenuation coefficient values of 0.92±1.12×10-3for CS137and 1.12±1.57×10-3for CO60attained, in this study were for concrete incorporate iron filling wastes of 30 wt. %. The iron balls and the steel slags gave much inferior values. The concrete incorporates iron filings provided the best shielding effect. The microstructure, concretefillings composite density, the homogeneity and particulate distribution were examined and evaluated using different metallographic, microscopic and measurement facilities.

The current research aims to compare some of the indicators of radioactive contamination, contained, absorbed dose (D), radium equivalent, (Ra eq), index of external and internal radiation hazard, (H ex , H in), and gamma activity concentration index, (I γ), in five soil samples unfertilized and other five fertilized with Iraqi origin fertilizers, to find the effect of fertilization on how much increases the radioactive contamination, the concentration of radioactive elements 226 Ra, 232 Th and 40 K in these samples estimated by using gamma ray system NaI (Tl). It has been reached that the values of indicators of the fertilized and unfertilized soil that the rate of absorbed dose 0.0819 μSv / h and 0.133 μSv/h, radium equivalent 138.56 Bq / kg and 319.31 Bq / kg, gamma activity concentration index, (Iγ) 0.987 and 2.23, the internal radiation hazard index 0.488 and 1.326, the external radiation hazard index 0.374 and 0.862 ,respectively. The surface exaltation rate of 222 Rn was estimated after finding the radon concentration by using nuclear track detector CR-39, the emission from the soil surface in general was less than the recommended value by UNSCEAR.