books.google.fr - Radioactivity can be detected at different levels in almost all objects all over the world, including the human body. This omnipresence of naturally occurring radioactivity is of immediate and crucial concern to people who work in the nuclear industry, to state and local authorities responsible for environmental...https://books.google.fr/books/about/Man_Made_and_Natural_Radioactivity_in_En.html?hl=fr&id=WqJfBgAAQBAJ&utm_source=gb-gplus-shareMan-Made and Natural Radioactivity in Environmental Pollution and Radiochronology