Abstract
The fertilizers are essential in agriculture as they supply nutrients to the farming fields. One of the sources of radioactivity other than those of natural origin is mainly due to extensive use of fertilizers. The concentrations of natural radionuclides, namely 226Ra,232Th and 40K in different chemical fertilizers used in agricultural soil were analyzed using gamma spectrometry with a high purity germanium (HPGe) detector in order to assess the implications of the extended use of phosphate fertilizers in recent years. The radiological impact assessment in an integrated manner assessing doses to members of the public via the atmospheric aquatic and secondary pathways was made. The concentration of major elements (AI2O3, SiO2, P2O5, SO3, CI, K2O, Fe2O3) along with other elements present in all samples were measured by X-ray fluorescence (XRF) analysis. The X-ray diffraction (XRD) system was used for analyzing the composition of fertilizer samples. The XRD results confirmed the presence of main constituents fluorapatite Ca5(PO4)3F, hydroxylapatite Ca5(PO4)3(OH) and chlorapatite Ca5(PO4)3CI of phosphate fertilizer samples.
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