Others would add either one or both of yttrium and scandium to the list.

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Now, the patient will receive two infusions of rituximab about a week apart, followed by an infusion of only Yttrium 90-Zevalin.

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Globally, there are only two major firms still engaged in rare earth smelting and separation, Rhodia of France and Nippon Yttrium in Japan.

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Then a coat is applied of yttrium, barium and copper, the metallic elements of YBCO, today's HTS recipe of choice, along with impurities just nanometres (billionths of a metre) across.

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