| FIRSTSTRIKE | Initial use of nuclear weapons |
| STAFFNOTATION | Employees, people accepting Old Trafford's initial use of lines to mark pitch (5,8) |
| MRI | The use of nuclear magnetic resonance of protons to produce proton density images. |
| ATOMICENERGYACT | Legislation that promoted peaceful uses of nuclear resources |
| ICBM | Shorthand for a type of long-range missile, used for delivery of nuclear weapons (4) |
| PROLIFERATION | Increase (of nuclear weapons) (13) |
| DETERRENCE | Eg, possession of nuclear weapons |
| TESTBAN | Agreement between nations to forgo trials of nuclear weapons (4,3) |
| NODDYSUIT | Clothing that protects wearer against physical effects of nuclear weapons (5,4) |
| NONPROLIFERATIONTREATY | International agreement negotiated in the 1960s, intended to prevent the spread of nuclear weapons |
| ROTBLAT | Sir Joseph, Polish-born physicist noted as a critic of nuclear weapons (7) |
| KILOTON | Unit traditionally used to rate the energy output, and hence destructive power, of nuclear weapons, whose symbol is kt |
| BIKINI | Travelling by bicycle endlessly on island site of nuclear weapons tests (6) |
| NARROW | Source of nuclear weapon strictly limited (6) |
| LANCE | Delicate material encasing head of nuclear weapon (5) |
| HBOMB | Type of nuclear weapon (1-4) |
| GROUNDZERO | Land directly under explosion of nuclear weapon in the air (6,4) |
| PLUTONIUM | Element whose isotopes are used as fuel in certain types of nuclear reactors and as an ingredient in nuclear weapons. It was first detected in 1941 by American chemists Glenn T. Seaborg, Joseph W. Ken |
| URANIUM | This element, whose isotopes are used as fuel in nuclear reactors and nuclear weapons, was discovered by German chemist Martin Heinrich Klaproth in 1789. One pound of this material yields as much ener |
| ICAN | Shortened form of the name of the 2017 winner, the International Campaign to Abolish Nuclear Weapons |
