The presence of radioactive residues in sampels of monocalcium phosphates.

Abstract

Balanced diet should satisfy all the needs of animals reguarding carbonydrates fats, proteins, vitamins and mineral matters in particular. Phosphate feeds soon as monocalcium phosphate (MCP), are inorganic compounas intended to meet the needs of animals for calcium and phosphorus, which are of great importance for bone building and have an important physiological role in all the cells of the organism. Monocalcium phosphate, Ca (H2PO4)2 2H2O, is produced from natural phosphate (apatite, phosphorite). The process consists of their decomposition by the action of mineral acids to obtain soluble hydrogen phosphate. By dissolving natural phosphate, uranium which is present in phosphate ores, is deposited in end-products i.e. MCP and falls enters the organisms of animals and humans through feed. In the presence of radioactive residues, 15 samples of MCP of different geographical origin were tested (Russia, Lithuania,Tunisia, Serbia and Brazil). Activity concentrations of radionuclide gamma emitters were determined by the method of low-level gamma spectrometry on a high resolution HPGe coaxial detector system produced by ORTEC with nominal efficiency of 28 perc resolution (FWHM) at 1.33 MeV 60Co of 1.67 keV and Peak-to-Compton ratio 67:1. The gamma spectra were acQuired and analyzed using the GammaVision@ software. The precision and accuracy of the method was tested using a certified reference material LR 320 (Deutschesher kalibrierdienst, Germany). The measured values for the concentration of activity [Bq/kg] of the tested radionuclides (137Cs, 226Ra, 232Th, 40K, 238U, 235U) in all the tested sampies are below the maximum of allowed values (Official Gazette of RS, No.