| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | plutonium 241 | nuclear industry | Plutonium 241 is used in nuclear reactors and weapons as a fissile material. | 2 |
| 2 | plutonium 241 | International community | Plutonium 241 is tightly regulated and controlled internationally to prevent nuclear weapon proliferation. | 1 |