| end up inside the plant | 0.30 |
| maintain sustained nucl… | 0.30 |
| undergo nuclear fission | 0.25 |
| account for 99.3% | 0.25 |
| half-life | 0.54 |
| 146 neutrons | 0.53 |
| identical chemical prop… | 0.41 |
| same number of protons | 0.34 |
| produced | 0.34 |
| used in nuclear weapons | 0.25 |
| known with mass numbers | 0.25 |