| Graphite and heavy water are ____ that slow down neutrons. |
6 |
| Nuclei ____ during nuclear fusion reactions. |
archaeological |
| Radioactive carbon-14 is used to study organic reaction ____. |
fuels |
| The ____ of two hydrogen atoms produces a helium atom. |
fusion |
| All carbon isotopes (e.g. C-12 and C-14) have ____ protons. |
heavy water |
| U-233, U-235, and Pu-239 are used as ____ in fission reactors. |
join together |
| Carbon-14 is used to date organic ____ samples. |
mechanisms |
| A molecule of ____ contains one or two atoms of deuterium. |
moderators |
