Discover how radioactive substances change over time, and how this affects whether they are hazardous to humans.
- Dangerous radioactive substances will not be dangerous forever due to radioactive decay.
- Radioactive decay is the process in which the nucleus of an unstable atom changes by emitting radiation.
- Different materials have different half-lives that can vary from fractions of a second to millions of years.
- Radioactive waste must be stored safely until it is no longer a health hazard.