| 1 | A | B | C | D | E |
| --- | --- | --- | --- | --- | --- |
| 2 | Nuclear fission product - Health concerns |  |  |  |  |
| 3 | Isotope | Radiation | Half-life | GI absorption | Notes |
| 4 | Strontium-90/yttrium-90 | β | 28 years | 30% | - |
| 5 | Cesium-137 | β,γ | 30 years | 100% | - |
| 6 | Promethium-147 | β | 2.6 years | 0.01% | - |
| 7 | Cerium-144 | β,γ | 285 days | 0.01% | - |
| 8 | Ruthenium-106/rhodium-106 | β,γ | 1.0 years | 0.03% | - |
| 9 | Zirconium-95 | β,γ | 65 days | 0.01% | - |
| 10 | Strontium-89 | β | 51 days | 30% | - |
| 11 | Ruthenium-103 | β,γ | 39.7 days | 0.03% | - |
| 12 | Niobium-95 | β,γ | 35 days | 0.01% | - |
| 13 | Cerium-141 | β,γ | 33 days | 0.01% | - |
| 14 | Barium-140/lanthanum-140 | β,γ | 12.8 days | 5% | - |
| 15 | Iodine-131 | β,γ | 8.05 days | 100% | - |
| 16 | Tritium | β | 13 years | 100% | - |

Question: What are the radioactive isotopes of nuclear fission?
Answer: ⁹⁰Sr and ¹³⁷Cs are the radioisotopes.