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By 1942, the British knew that Germany had chosen heavy water, or deuterium oxide, to moderate atom-splitting chain reactions to produce bomb-grade plutonium.

Large amounts of heavy water, or deuterium oxide, at that time was only made at the Norsk Hydro facility in Rjukan, Telemark.

It was handicapped by the flight and murder of Jewish scientists but suffered most gravely from a decision by the physicist Werner Heisenberg to use heavy water, deuterium oxide, instead of graphite, as a so-called moderator in the production of bomb-grade uranium.

Prized for its purity, Norwegian heavy water, or deuterium oxide, is used as a coolant in nuclear reactors and to produce plutonium, an ingredient in nuclear bombs.

First and most obvious heavy hydrogen compound is deuterium oxide�heavy water.