Radiation detector assembly and method with discrimination betwe

Details Radiation detector assembly and method with discrimination betwe Radiation detector assembly and method with discrimination betwe

1996-09-19

1998-04-28

Wong, Don

Radiant energy

Invisible radiant energy responsive electric signalling

With or including a luminophor

250254, 250261, 250262, G01T 120

Patent

active

057448035

ABSTRACT:
A well logging instrument and method that remove vibration induced noise from the output of a detector including a scintillation crystal. The invention is based on a realization that pulses induced by vibration during MWD operations are characteristically periodic, whereas pulses generated down hole by gamma rays occur at random intervals and are characteristically non-periodic. The instrument and method involve positioning a scintillation crystal package in the high vibration environment for interaction with incident radiation, using a light sensing device to convert photons received from the scintillation crystal package into an electrical signal which over time is composed of radiation induced events that are non-periodic and vibration induced events that are periodic, distinguishing the periodic events using a time history of the electrical signal, and removing the periodic events from the electrical signal to provide a corrected electrical signal from which vibration induced components have been removed. Also disclosed is a method for using the information gathered for vibration induced events to give an indication of the remaining lifetime of the scintillation crystal.

REFERENCES:
patent: 4879463 (1989-11-01), Wraight et al.
patent: 5023450 (1991-06-01), Gold

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