What is radioactivity
You don't see it, and you don't feel it: radiation. Nevertheless, humans are always exposed to radiation. Shielding makes sense. Natural radioactive substances in soils and rocks emit radiation. And it comes not only from the earth, but also from heaven. The higher, the stronger the cosmic rays. It is already relevant for long-haul flights at an altitude of several kilometres. But what is radioactivity and radiation anyway? Original: "Federal Office for Radiation Protection" Original: German. All translations in this video have been done by the alugha AI.