| Similarity | Rank | |
|---|---|---|
| polonium-210 | 0.849 | 71984 |
| caesium-137 | 0.832 | 59747 |
| caesium | 0.832 | 37760 |
| radioactivity | 0.830 | 14083 |
| beryllium | 0.830 | 52345 |
| iodine-131 | 0.815 | 51608 |
| radio-active | 0.812 | 71832 |
| strontium-90 | 0.808 | 87007 |
| rbmk | 0.805 | 73850 |
| kiloton | 0.804 | 58161 |
| calorimeter | 0.798 | 56876 |
| tritium | 0.798 | 26341 |
| radionuclide | 0.789 | 25560 |
| windscale | 0.788 | 22783 |
| thermonuclear | 0.781 | 25747 |
| helium-3 | 0.781 | 45115 |
| alloprene | 0.780 | 83778 |
| carbon-14 | 0.779 | 58995 |
| naturally-occurring | 0.778 | 73009 |
| anthropogenic | 0.774 | 51620 |
| ionize | 0.774 | 32044 |
| radium | 0.773 | 42478 |
| fbr | 0.771 | 69198 |
| tropospheric | 0.770 | 67421 |
| high-velocity | 0.770 | 66843 |