Across
- 4. The combining of nuclei of light atoms to form heavier nuclei.
- 7. The minimum mass of fissionable material needed for a sustainable chain reaction.
- 8. The unit for measuring radiation dosage in humans based on harm to living tissue.
- 9. An electron emitted during the radioactive decay of a radioactive nucleus.
Down
- 1. The time required for half the atoms in a sample of a radioactive isotope to decay.
- 2. A self-sustaining reaction in which the products of one reaction event initiate further reaction events.
- 3. A subatomic particle made up of the combination of two protons and two neutrons ejected by a radioactive nucleus. The composition of an alpha particle is the same as that of the nucleus of a helium atom.
- 5. The high-energy particles and electromagnetic radiation emitted by a radioactive substance.
- 6. High-frequency electromagnetic radiation emitted by radioactive nuclei.
- 10. A quantity of radiant energy equal to 0.01 J absorbed per kilogram of tissue.