Assessment of Natural Radionuclides in Some Powdered milk Samples Consumed in Yemen and Estemated of the Corresponding annual Effective Dose

Wail Mohammed Saeed Al-Sharabi

Abstract


The aim of this study is to know how much the some imported and produced milk are contaminated with naturally occuring and man- made radionuclide as Cesium. Seven samples of powdered  milk samples were collected. They are  the most consummed in Yemen. These Samples were prepared in the laboratory, sieved through a fine mesh, well sealed in standard Marinelli beakers (30ml) for about four weeks in order to establish secular equilibrium between Th232 and Ra226  with their progeny. Gamma ray spectroscopy is used to analyze the samples and the concentrations of radioisotopes were determined in  Bq/kg by  using hyper-purity germanium (HPGe) detector  Canberra  p-type (model) 707 with a relative efficiency of 30% and energy resolution is of 1.85 keV .

the average  concentrations of  Th232 , Ra226 and K40 were found  to be concentrations of    5.37 , 31.29 and 96.84 Bq/ kg respectively in powdered milk samples. Also, the total average annual doses received from the intake of K40, Th232 ,Ra226, and due to the ingestion of the powdered milk were measured (in mSv): 970.575, 660.81and 315.50 for infants, children and adults, respectively. These results indicate that infants have a higher risk factor compared with other age groups. Finally, the measured activity concentrations for these radionuclide were compared with  the reported data obtained from similar foodstuffs consumed in other countries and with International references value. The value of the average  activity concentration of the radionuclides Th232 , Ra226 measured in powdered milk samples are higher than the international values, but it is lower  for K40 in all samples.


Keywords


Radionuclide Concentrations, Milk, Radiation dose, Annual Effective Dose, high-purity germanium (HPGe) detector.

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References


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DOI: http://dx.doi.org/10.52155/ijpsat.v23.2.2204

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