G - Physics – 01 – V
Patent
G - Physics
01
V
G01V 13/00 (2006.01) G01T 1/40 (2006.01) G01V 5/12 (2006.01)
Patent
CA 2264426
A method for calibrating a logging tool that is exposed to an external energy spectrum, comprising the steps of: (a) providing a stabilization source that emits a stabilization signal having a known energy; (b) providing a receiver that receives a total spectrum that comprises the sum of the external energy spectrum and the received stabilization signal; (c) discerning the stabilization signal in the total spectrum by the steps of: calculating the centroid of the area under the total spectrum; adjusting the gain of the tool on the basis of the calculated centroid; dividing a portion of the spectrum that includes the known energy level of the stabilization peak into a number of windows of equal width, with an equal number of windows on either side of the stabilization peak energy; using the count rates in each of the windows to calculate a value D n that is proportional to the n th derivative of the spectrum at the stabilization peak energy; and adjusting the gain of the tool on the basis of the value of D n
Deeth Williams Wall Llp
Halliburton Energy Services Inc.
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