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Design and field test of scintillation probe for γ-logging of small diameter boreholes (1974)

Sprecher, C. ; Rybach, L.

Springer

Pure and applied geophysics 112 (1974), S. 563-570

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ISSN: 1420-9136

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences , Physics

Notes: 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.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00877293

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