These are created by radiation of many kinds, some coming from above, such as cosmic rays, and some from rocks, such as the decay of radioactive minerals. (kavlifoundation.org)
This uses radioactive minerals that occur in If you are looking for the best online dating site, then you come to the right place. (myintimcity.com)
The government has cleaned up most of the «trinitite», the glassy green radioactive mineral formed by the blast. (newscientist.com)