Nuclear Energy

3. The liquid or gas used to transfer heat from the reactor core to the steam generators or turbines.
4. the smallest unit of ordinary matter that forms a chemical element.
6. a thing that is composed of two or more separate elements; a mixture.
8. the emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles which cause ionization.
10. a reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei.
11. a particle emitted from an atom during radioactive decay, generally electrons (with negative charge) but may be positrons.
13. The period required for half of the atoms of a particular radioactive isotope to decay

1. devices to absorb neutrons so that the chain reaction in a reactor core may be slowed or stopped by inserting them further, or accelerated by withdrawing them.
2. a pure substance consisting only of atoms that all have the same numbers of protons in their nuclei.
5. ray a penetrating form of electromagnetic radiation arising from the radioactive decay of atomic nuclei
7. a reaction in which the nucleus of an atom splits into two or more smaller nuclei
9. The central part of a nuclear reactor containing the fuel elements
12. a positively-charged particle emitted from the nucleus of an atom during radioactive decay.