Wide band gap semiconductor photodetector based gamma ray detectors for well logging applications
First Claim
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1. An apparatus configure to estimate a value of a property of an earth formation;
- the apparatus comprising;
a device configured to be conveyed in a borehole;
a scintillation detector associated with the device and configured to produce a light signal responsive to gamma rays indicative of the property;
a photodiode configured to produce an electrical signal responsive to the light signal responsive to the gamma rays indicative of the property, the photodiode having a spectral response characteristic that matches the spectral output of the scintillation detector;
an additional device configured to improve the match between the spectral output of the scintillation detector and the spectral response of the photodiode, the additional device being selected from (i) a pressure altering device, or (ii) a temperature altering device; and
a processor configured to estimate the value of the property using the electrical signal.
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Abstract
A gamma ray detector uses a scintillation detector having a response that matches a response characteristic of a photodiode. The detector may be used to measure natural gamma rays and/or gamma rays produced by interaction of neutrons from a neutron source with the earth formation.
41 Citations
18 Claims
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1. An apparatus configure to estimate a value of a property of an earth formation;
- the apparatus comprising;
a device configured to be conveyed in a borehole; a scintillation detector associated with the device and configured to produce a light signal responsive to gamma rays indicative of the property; a photodiode configured to produce an electrical signal responsive to the light signal responsive to the gamma rays indicative of the property, the photodiode having a spectral response characteristic that matches the spectral output of the scintillation detector; an additional device configured to improve the match between the spectral output of the scintillation detector and the spectral response of the photodiode, the additional device being selected from (i) a pressure altering device, or (ii) a temperature altering device; and a processor configured to estimate the value of the property using the electrical signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- the apparatus comprising;
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10. A method of estimating a value of a property of an earth formation;
- the method comprising;
conveying a device configured into a borehole; using a scintillation detector associated with the device for producing a light signal responsive to gamma rays indicative of the property; using a photodiode for producing an electrical signal responsive to the light signal responsive to the gamma rays indicative of the property, the scintillation detector having a spectral output that matches a spectral response characteristic of the photodiode; using an additional device for improving the match between a spectral output of the scintillation detector and a spectral response of the photodiode, the additional device being selected from (i) a pressure altering device, or (ii) a temperature altering device; and using a processor for estimating the value of the property from the electrical signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
- the method comprising;
Specification