Food and drinking water

STUK monitors radioactivity in Finnish food on a continuous basis. The natural radioactivity in food exposes each Finn to a radiation dose of 0.3 millisieverts per year. Natural radioactivity refers to radioactive substances that are naturally present in the environment, such as the potassium isotope K-40, uranium, thorium and their decay products. Radiation exposure caused by artificial radioactive substances, i.e., substances generated through human activity, is less than ten per cent of this.