Is radiation is a man made disaster?

Answer 1

Some nuclear radiation is man-made and some is natural. Most nuclear radiation is natural - a result of various naturally occuring isotopes of different elements. Much man-made radiation is beneficial including isotopes used to combat cancer. Of course some of the man-made instances are definitely disasters such as the atom bombs dropped at the end of WWII - although it can be persuasively argued that they were a disaster only for those subject to the blast and subsequent radiation while being beneficial to those saved by the quick end to the war.

Answer 2

Absolutely ! Naturally occurring radio-active materials are too weak to cause problems. It's only when you refine the raw materials into products that emit useful levels of radiation - that you need to take expensive precautions to protect the environment and people. Failure of the precautions is ALWAYS a man-made 'disaster' !