- - Property of uranium, e.g.
- - Emission disintegrating atomic nuclei give out
- - Spontaneous emission of energy from atomic nuclei
- - Emission from, eg, uranium
- - phenomenon whereby unstable atoms release energy, first discovered by henri becquerel
- - What a Geiger counter measures ... or, as two words, what the ends of 20-, 26- and 48-Across are
- - Subject for 17 Across
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