Determination of the 87 Rb decay constant

Details Determination of the 87 Rb decay constant Determination of the 87 Rb decay constant

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gecoa..41.1745d&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 41, Issue 12, pp.1745-1749

Physics

3

Scientific paper

The decay constant 87 Rb has been redetermined by measuring the amount of radiogenic 87 Sr produced over a period of 19 years, in 20 g samples of purified RbClO 4 , using isotope dilution techniques. The rubidium sample was spiked with 84 Sr and the nanogram quantities of strontium separated by coprecipitation with Ba(NO 3 ) 2 . Analyses were carried out on a 25cm, 90° sector mass spectrometer equipped with a Spiraltron electron multiplier. Measurement of three independent ratios permitted continuous monitoring of the ion beam fractionation. The average of nine determinations gives a value for the decay constant of 1.419(±0.012) × 10 -11 yr -1 (2 ). [ .]

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