Gated spectral well logging radiation detection system

Abstract

Abstract A gated spectral radiation detector system which operates with sharp turn-on rise and turnoff decay times, high signal-to-noise ratio, good linearity and temperature stability. The system is capable of use in well logging operations. Detected radiation is converted to electrical pulses or signals proportional to the energies of the detected radiation. These signals are amplified and transmitted to the surface where they are processed and recorded. Components of the system include a surface AC power source and subsurface means for changing the AC power to DC; a radiation detector for detecting and converting radiation energies to electrical signals; an amplifier powered by DC and preferably including feedback circuits to reduce distortion of the electrical signals and produce a desired amplifier output impedance; timer means powered by DC to produce a positive pulse which is shaped and split to produce two pulses having amplitudes which produce minimum distortion and high on-off ratio of the radiation detector; and other means to change the AC power source to DC power to operate the detector. A variation in the detector system provides for two gated detectors capable of simultaneous detection of radiation which originates at the same or different times or simultaneous detection of gamma radiation originating at a particular time and sensing of the magnitude of neutron flux at any predetermined time.

Inventors

• 👤 Wilmer A Hoyer
• 👤 Robert C Rumble
• 👤 Donald H Britton

Bibliographic Details