Occupational radiation dose estimation over radioactive waste of phosphoric acid purification and ore products projects

Document Type : Original Article

Authors

1 physics Dept. Faculty of Science, Al-Azher University

2 Nuclear Material Authority (NMA)

3 Nuclear Research Center, Egyptian Atomic Energy Authority (EAEA)

Abstract

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.

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