Determination of the activity level in powdered milk available in Tunisia and assessment of the radiological risks

A set of measurements have been carried out in order to determine the activity-levels in some powdered milks available in Tunisia. The study has shown that the average activity is about 160 ± 19 and 2.26 ± 0.5 Bq/kg respectively for 40K and 137Cs, whereas it is below the detection limit for 226Ra and 232Th. The mean annual ingestion dose is about 102 and 225 \(\upmu\,{\text{Sv}}/{\text{y}}\) for respectively ≤ 1 year and 1–2 years old infants. The calculation of the radiological risk show that no significant threat on the infant’s health due to consumption of these milks.