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Design and field test of scintillation probe for γ-logging of small diameter boreholes

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Summary

A 68-cm long probe of 2.5 cm diameter, containing a NaI (Tl) crystal, photomultiplier, HV stabilization and preamplifier, is described. Special attention is paid to the probe-cable coupling: it is designed to withstand hydrostatic pressures up to 10 atm. For logging of inclined, up to 20 m long holes, aluminium extension pipes assembled by push-button closures are used. The probe, operated together with a portable ratemeter, has a sensitivity of 1200 c.p.s. per mR/h (Ra226). For quantitative log interpretation the conversion factor was determined to be 0.4 p.p.m. U/c.p.s. Radiometrically determined uranium contents agree remarkably well with results of chemical analysis of cores.

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Authors and Affiliations

  1. Institute of Geophysics, ETH, Zürich

    C. Sprecher & L. Rybach

Authors
  1. C. Sprecher
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  2. L. Rybach
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Additional information

Contribution No. 89, Inst. of Geophysics, ETH, Zürich.

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Sprecher, C., Rybach, L. Design and field test of scintillation probe for γ-logging of small diameter boreholes. PAGEOPH 112, 563–570 (1974). https://doi.org/10.1007/BF00877293

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  • DOI: https://doi.org/10.1007/BF00877293

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