Computer Science
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.1817f&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 53, Issue 8, pp.1817-1823
Computer Science
5
Scientific paper
Concentrations of natural 129 I and 36 Cl in ground water from the Stripa granite, Sweden, were determined by accelerator mass spectrometry. The 129 I values range from 1 × 10 6 to 2 × 10 8 atoms 1 -1 , orders of magnitude greater than the estimated background concentration in pre-1945 rainwater of 2 × 10 4 atoms 1 -1 . Expressed as a ratio 129 I / 127 I , values range from 3 × 10 -12 to 2 × 10 -10 , compared to about 1 × 10 -12 in pre-1945 rainwater. Ratios, as well as concentrations, generally increase with sample depth, which ranges from 360 to >1000 m below the surface. The accumulation of 129 I in the water is attributed to subsurface production by spontaneous fission of 238 U in micro-fractures in the granite matrix and subsequent transfer of this 129 I by diffusion into fractures constituting the flow system of the granite. Uncertainties in the spontaneous-fission yield at mass 129 and in the assumption of steady-state mass flux prevent quantitative estimates of the rate of 129 I transfer.
Davis Stanley N.
Elmore David
Fabryka-Martin June T.
Kubik Peter W.
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