| A | B |
|---|
| fusion | joining of atomic nuceli |
| fission | splitting of atomic nuclei |
| half-life | time it takes for half a radioactive material to become nonradioactive |
| gamma rays | stopped by minimum of lead and concrete |
| beta radiation | stopped by thick aluminum or plastic |
| alpha radiation | stopped by a sheet of paper |
| how much of a 8 gram radioactive sample is left after 2 half-lives | 2 |
| radiation | particles & energy given off by a radioactive nucleus |
| nuclear radiation | describes a nucleus that gives off radiation |
