1Physics Department Faculty of Science, Al-Azher University (Egypt)
2,3Nuclear Material Authority (NMA) (Egypt)
4,5Nuclear Research Center, Egyptian Atomic Energy Authority (EAEA) (Egypt)
Radioactive materials concentration of four studied waste samples resulted from Phosphoric acid purification project and ore products project were measured using gamma ray spectrometry (high purity germanium-HPGe detector). These concentrations were measured for U- 238 in range of (471.6-5.8×103) Bq/kg [(38.02-469.6) ppm] , Th-232 ranged between (34-1.33×103) Bq/kg [(8.4-326.9)ppm] Ra-226 ( 227- 8346) Bq/kg [(18.4-699.1) ppm] and K-40 (263-1156) Bq/kg [(0.8-3.7) ppm].Measurement of radon daughter and uranium concentration in air consider by work level (WL) at indoor site for phosphoric acid purification and ore products projects equal 0.012 and 6.48×10-3 WL respectively. Also it observed that there is no uranium concentration in air. Although the U- 238, Th-232 and Ra-226 concentration were higher than the recommended concentration for terrestrial radionuclide in waste samples but also the annual effective doses for workers were in the acceptable dose limit because the methods used for treatment and leaching process lead to separation the most of radioactive material.
Department of Geology, RTM Nagpur University, Nagpur-440001 (India)
The Sakoli fold belt mainly comprises the supracrustal rocks of Lower to Middle Proterozoic age. These include metapelites, quartzite, basalt and rhyolite along with some intrusion of granitic and gabbroic rocks. This area is positioned at the southern margin of the Central Indian Tectonic Zone and also at northern margin of the Baster Craton.
This areal extent of the CITZ is about 5000km2. Nawargaon- Chowa area belongs to Sakoli Group of rocks which is structurally very complex which reflects in different phases folding, at some places it is extremely mylonitised, sheared and silicified with low to medium grade of metamorphism. In the study area the exposures of kyanite, quartzite and chlorite schist shows the strike direction NW-SE with a dip of 500 to 650due NE.Pyrophyllite of the study area is characterized by wide spectrum of textural varieties confirming to varying grades including refractory. The kyanite schist is pale greenish in colour, which shows medium grained texture and schistose structure with some ferruginous matrix surrounding the quartz grain. Major oxide data of kyanite and pyrophyllite samples shows that the alumina and silica is the major component. The Al2O3 percentage in pyrophyllite is ranging from 47.22 to 51.56 %.