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For the definition of the term "isotopes", see Part (Ⅰ) of Explanatory Note to heading 28.44.
This heading covers stable isotopes, that is, non‑radioactive isotopes and their inorganic or organic compounds, whether or not chemically defined.
The heading includes the following isotopes and their compounds :(1) Heavy hydrogen or deuterium. This is separated from normal hydrogen in which it occurs at a level of 1 part in 6,500. (2) Heavy water, which is deuterium oxide. Occurring in ordinary water at a level of 1 part in 6,500. It is normally obtained as a residue of the electrolysis of water. Used as a source of deuterium, and in nuclear reactors for slowing down the neutrons which split the uranium atoms. (3) Other compounds made with deuterium, e.g., heavy acetylene, heavy methane, heavy acetic acids and heavy paraffin wax. (4) The isotopes of lithium known as lithium 6 or 7, and their compounds. (5) The isotope of carbon known as carbon 13, and its compounds.
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