THE HALF LIFE OF Rb$sup 8$$sup 7$ (in German)
The half life of Rb/sup 87/ was measured by the following method: NaI(Tl) + RbI and CsI(Tl) + RbI scintillation crystals were grown containing 1.13 and 13 wt% RbI resp. The integral counting rates of these crystals were determined by extrapolation of the integral spectrum from 4 kev (NaI(Tl)) and 6 kev (CsI(Tl)) to zero energy. Then these crystals were pulverized, and the powder was counted in layers of saturation thickness in a methane flow counter. The counting rates of the flow counter were attached to the Rb contents of the layers by measuring mixtures of NaI(Tl) + RbI and CsI(Tl) + RbI powder of known compositions. By this procedure we determined the specific activity of natural rubidium at (744 plus or minus 15) cps/g and the half life of Rb/sup 87/ at (5.80 plus or minus 0.12) x 10/sup 10/ years. This result agrees with other determinations obtained with scintillation crystals, but disagrees with results obtained with counter tubes and geological determinations. (auth)
- Research Organization:
- Universitat, Heidelberg
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-17-009598
- OSTI ID:
- 4732550
- Journal Information:
- Z. Physik, Vol. Vol: 169; Other Information: Orig. Receipt Date: 31-DEC-63
- Country of Publication:
- Country unknown/Code not available
- Language:
- German
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