The concentrations of radioactive substances in the environment and foodstuffs are constantly monitored by STUK. In a fallout situation, a sampling and analysis programme for assessing the situation is planned by STUK together with national food authorities. In addition to STUK, the programme comprises about 50 municipal laboratories committed to measuring radioactivity of foodstuffs.
Customs monitors the concentrations of radioactive substances in imported foodstuffs. STUK provides expert assistance for Customs. Customs monitors the radiation levels of vehicles and their loads arriving in Finland too.