What things make a state “nuclear,” what makes things “nuclear,” and how do we know? The degree to which—and purpose for which—a nation, a program, a technology, or a material counts as “nuclear” is not always a matter of consensus. Nuclearity depends on history and geography, science and technology, bodies and politics, radiation and race, states and capitalism. It is not so much an essential property of things, as it is distributed in things. Settlements about degrees of nuclearity structure global (...) control over the flow of radioactive materials; they constitute the conceptual bedrock of antinuclear movements and nuclear power industries; they affect regulatory frameworks for occupational health and compensation for work‐related illnesses. This essay explores these themes by contemplating the Nuclear Non‐Proliferation Treaty, the implementation of safeguards, and a few other nuclear things. (shrink)