Radioactive elements are found everywhere in the environment. Detectable amounts occur naturally in soil, rocks, water, air and vegetation and may be ingested if they enter the food chain, or, inhaled. Inhaled and ingested ...

Exposure to ionizing radiation from 40K and those in the decay chains of 238U and 232Th for a prolonged time poses danger to human population. While 238U, 232Th and 40K are universally present in rock and soil, their ...