Physics
Scientific paper
Nov 1959
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1959gecoa..17..226g&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 17, Issue 3-4, pp.226-233
Physics
Scientific paper
A technique has been developed that permits the determination of uranium-daughter product equilibrium in polished sections by combining and fission fragment radiography. The procedure consists of placing an uncovered rock section in contact with, first, an -sensitive emulsion to record the -particle emission from uranium and its eight -emitting daughter products, and second, an emulsion sensitive to fission fragments (but not -particles) to record the tracks of fission fragments produced from U 236 when the slide is bombarded with thermal neutrons. A sample with approximately 100 p.p.m. of uranium in equilibrium emits about 570 -tracks/cm 2 per day in an autoradiograph, and about 10,000 fission fragment tracks/cm 2 per hr, when exposed to a neutron flux of 2·25 × 10 10 neutrons/cm 2 per sec. A sample deficient in uranium daughter products will release relatively more fission fragment tracks than -tracks, and the opposite is true if the sample has a deficiency of uranium with respect to daughter products. The technique has the advantages of being non-destructive, applicable on a micro scale, and suitable for use on samples having uranium contents as low as 10 p.p.m.
Bates T. F.
Grace J. D.
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