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The Royal Navy's helicopter squadrons are omitted since basing of single helicopters embarked on numerous small escort ships is difficult to collate reliably.

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In 1902, Frederick Soddy proposed the theory that "radioactivity is the result of a natural change of an isotope of one element into an isotope of a different element." Nuclear reactions involve changes in particles in an atom's nucleus and thus cause a change in the atom itself.

All elements heavier than bismuth (Bi) (and some lighter) exhibit natural radioactivity and thus can "decay" into lighter elements.

Curie found that radiation was proportional to the amount of radioactive element present, and she proposed that radiation was a property of atoms (as opposed to a chemical property of a compound).

Marie Curie was the first woman to win a Nobel Prize and the first person to win two (the first, shared with her husband Pierre Curie and Henri Becquerel for discovering radioactivity; the second for discovering the radioactive elements radium and polonium).

Re-evaluation of domestic energy policy resulted in diversification and in particular, a major nuclear construction program.

A high priority was given to reducing the country's dependence on oil imports.

This restriction extends to animals that consume seafood in their diet.

electrons around an atom's nucleus (see our Chemical Reactions module for more information).

Today it depends on imports for over 90% of its primary energy needs.

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