FIELD: analytical and radiochemistry. SUBSTANCE: method involves sampling BF3 of natural isotope composition into glass ampoule by sorption with preliminary heated evacuated carbon BAU, SKT, SKT-2, SKT-2B, SKT-3, SKT-4A, SKT-6A, SKT-7, AT-3. Carbon is heated at Td = 573 K and Pd = 1.3 x 10-4 Pa. Sorption of BF3 is carried out under atmospheric pressure and room temperature. Into other glass ampoule the preliminary prepared ether solution of Grignard reagent is placed. Both ampoules and the third ampoule also used for trimethylboron receiving are connected with vacuum unit. Grignard reagent ether solution is frozen and evacuated. Then desorption of BF3 from carbon is carried out by heating the first ampoule to Th = 673 K at Ph = 0.031 MPa. Grignard reagent solution is heated to the room temperature and BF3 and Grignard reagent are interacted to yield trimethylboron. Synthesized trimethylboron is collected into the third ampoule and transferred in mass-spectrometer. Trimethylboron mass-spectrum is recorded and its isotope composition is determined by ratio of intensity of peaks of 10B+ and 11B+. Transfer value of BF3 to trimethylboron is 99%, not less. Isotope composition corresponds to the reference value for the natural composition: 19 ± 0.2 at.% of B-10 and 80 ± 0.2 at.% of B-11. Invention can be used in preparation and separation of boron isotopes and control of nuclear reactor exploitation. EFFECT: improved method of isotope composition assay. 4 cl, 11 ex
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Authors
Dates
2001-05-20—Published
1999-08-18—Filed