Method and apparatus for natural gamma ray spectrum analysis usi

Details Method and apparatus for natural gamma ray spectrum analysis usi Method and apparatus for natural gamma ray spectrum analysis usi

1979-05-24

1981-06-02

Smith, Alfred E.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250253, 250256, G01V 500

Patent

active

042713560

ABSTRACT:
Gamma spectrum measurement signals received from a downhole instrument containing a scintillation counter are coupled into a multi-channel analyzer. The analyzer converts the received pulses to pulses in separate channels according to energy levels of the received measurements. The energy channels from the multi-channel analyzer are coupled to digital decoders which are set up for energy level windows for preselected elements and the total occurrence count. These outputs are coupled into a microprocessor stripper which includes storage buffers sized in accordance with the logging rate and crystal utilized in the scintillation counter. These storage registers permit filtering in addition to stripping the various energy channels of the influence radiation caused by the elements having and energy band centered around a higher energy level. After the stripping occurs, the outputs for each of the selected energy channels may be coupled into a digital recorder or into count rate meters for conversion to analog voltages for driving a chart recorder.

REFERENCES:
patent: 3336476 (1967-08-01), Richardson
patent: 3940610 (1976-02-01), Dennis et al.
patent: 3976878 (1976-08-01), Chevalier et al.
patent: 4013874 (1977-03-01), Culver
patent: 4071755 (1978-01-01), Supernaw et al.

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