Stabilizing a Spectrum Using Two Points

摘要

A histogram includes a plurality of channels Ch1, Ch2, . . . ChN, which have respective channel numbers C1, C2, . . . CN. ChA with channel number CA, 1

主权项

1. A method comprising:
receiving a histogram comprising:
a plurality of channels Ch1, Ch2, . . . ChN,wherein channels Ch1, Ch2, ChN have respective channel numbers C1, C2, . . . CN;wherein each channel has associated with it a respective count, C1-count, C2-count, . . . CN-count, representing a number of rays having energies in the range of energy associated with that channel received by an apparatus over a detection period of time; determining that a first-peak channel (ChA with channel number CA, 1B) represents a second peak in the histogram; determining that ChB is associated with a known second-peak energy (EB); solving a system of equations for an energy scale, κ (having units energy/channel), and
a zero offset, E0, wherein:a first equation in the system of equations is a function of EA and CA, anda second equation in the system of equations is a function of EB and CB; using a function of EM, CM, κ, and E0 to identify features in the histogram, wherein EM is an energy associated with the Mth channel in the histogram, and CM is the channel number of the Mth channel (ChM) in the histogram; using the identified features in the histogram to calculate a parameter of a formation from which the histogram originated; and using the calculated parameter to make a decision about a well.