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STRONTIUM
Natural Abundance, Stable Isobars Sr84, 0.56%, Kr84 Sr86, 9.86%, Kr86 Sr87, 7.02%, aRb87 Sr88, 82.56% Charge materials which have been used for the separation of the isotopes of strontium include strontium bromide and strontium metal. The use of SrBr2 as a charge material permits the simultaneous collection of the isotopes of both strontium and bromine. The usual charge consists of 250 g SrBr2 in a style C-16 graphite charge bottle. Strontium metal is the preferred charge material for those separations in which bromine is of no interest. The usual Sr metal charge consists of 175 g of the element in a style S-18 stainless steel charge bottle. Strontium bromide can be procured from commercial sources; however, it also has been prepared from the metal and carbonate by the procedure described for bromine. When using Sr metal as charge material it is necessary to isolate the strontium vapor from hot graphite source components. The inside of the ionization chamber is lined with stainless steel, and the graphite exit slit is replaced with one fabricated from stainless steel. Strontium metal is considered a fire hazard since it reacts with moisture to evolve hydrogen, which can form an explosive mixture. The use of rubber gloves and safety glasses is recommended when handling strontium and its compounds. aRb87 , natural abundance 27.85%, is radioactive with a half-life of 5 × 1010 years. |
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