Method and apparatus for measuring gamma rays in a borehole

Details Method and apparatus for measuring gamma rays in a borehole Method and apparatus for measuring gamma rays in a borehole

1981-06-04

1984-02-21

Howell, Janice A.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250262, G01V 500

Patent

active

044332408

ABSTRACT:
A gain stabilization loop for a gamma ray spectroscopy technique uses count rates from a pair of contiguous windows positioned on either side of at least one or more peaks of the detected spectrum. These count rates are combined to generate an error signal which minimizes the statistical errors. The stabilization loop modifies the response of the measurement apparatus so as to cancel the error signal.

REFERENCES:
patent: 3428804 (1969-02-01), Comunnetti
patent: 3767921 (1971-10-01), Jones
patent: 3922541 (1975-11-01), Seeman
Hewitt, "On the Resolution Function for Digitally Stabilized Nuclear Spectrometers", IEEE Trans on Nuc. Science, vol. NS-17, pp. 242-251, Feb. 1970.
Dudley et al., "Stabilization of a Gamma Scintillation Spectrometer Against Zero and Gain Drifts", Nuc. Inst. & Meth. vol. 25, (1964), pp. 297-313. _

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