An assessment of natural and artifical radionuclide content in powdered milk consumed by infants and toddlers in Singapore
摘要
High-resolution gamma spectrometry was employed to evaluate radioactivity levels in powdered milk sold in Singapore. The mean activity concentrations of 228Ra, 226Ra, 40K and 137Cs in infants’ powdered milk were determined to be 0.442 Bq/kg, 0.251 Bq/kg, 197 Bq/kg and 0.080 Bq/kg respectively, while activity levels in powdered milk consumed by toddlers were 0.494 Bq/kg for 228Ra, 0.216 Bq/kg for 226Ra, 263 Bq/kg for 40K and 0.119 Bq/kg for 137Cs. Annual total effective doses and radiological risk were also estimated for both age groups. The results indicated that consumption of powdered milk poses insignificant health risk to infants and toddlers.