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Intrinsic germanium detector used in borehole sonde for uranium exploration

January 1, 1976

A borehole sonde (~1.7 m long; 7.3 cm diameter) using a 200 mm2 planar intrinsic germanium detector, mounted in a cryostat cooled by removable canisters of frozen propane, has been constructed and tested. The sonde is especially useful in measuring X- and low-energy gamma-ray spectra (40–400 keV). Laboratory tests in an artificial borehole facility indicate its potential for in-situ uranium analyses in boreholes irrespective of the state of equilibrium in the uranium series. Both natural gamma-ray and neutron-activation gamma-ray spectra have been measured with the sonde. Although the neutron-activation technique yields greater sensitivity, improvements being made in the resolution and efficiency of intrinsic germanium detectors suggest that it will soon be possible to use a similar sonde in the passive mode for measurement of uranium in a borehole down to about 0.1% with acceptable accuracy. Using a similar detector and neutron activation, the sonde can be used to measure uranium down to 0.01%.

Publication Year 1976
Title Intrinsic germanium detector used in borehole sonde for uranium exploration
DOI 10.1016/0029-554X(76)90047-1
Authors F. E. Senftle, R.M. Moxham, A.B. Tanner, G. R. Boynton, P. W. Philbin, J.A. Baicker
Publication Type Article
Publication Subtype Journal Article
Series Title Nuclear Instruments and Methods
Index ID 70011167
Record Source USGS Publications Warehouse
USGS Organization Mineral Resources Program