Nuclear energy

1. The metal tubes containing oxide fuel pellets
3. a material that stops radiation
4. The central part of a nuclear reactor containing the fuel elements and any moderator.
5. A particle of matter which cannot be broken up by chemical means.
6. Used fuel assemblies removed from a reactor after several years used and treated as waste
7. Incapeable of spontainious radioactive decay
11. The adverse health effect of a radionuclide due to its radioactivity.
13. The liquid or gas used to transfer heat from the reactor core to the steam generators or directly to the turbines.
14. a particle of matter indivisible by chemical means.
15. Disintegration of atomic nuclei resulting in the emission of alpha or beta particles

2. Permanent removal of a facility
4. Chemical process turning U3O8 into UF6 preparatory to enrichment
8. The naturally-occurring ionising radiation which every person is exposed to, arising from the Earth's crust
9. The smallest mass of fissile material that will support a self-sustaining chain reaction under specified conditionsRadium: A radioactive decay product of uranium often found in uranium ore.
10. The energy absorbed by tissue from ionising radiation.
12. A general term denoting the quantity of radiation or energy absorbed in a specific mass