A method of stabilizing the resolving time of a nuclear acquisition system in real-time

In well logging situations where the scintillation detector is at the ambient temperature of the surrounding environment, the operating characteristics of the detector can change. The device described uses the output of the gamma-spectrometer to adjust the pole-zero of the amplifier dynamically. It accomplishes this by maintaining the counting rate losses, or piled-up pulses, to a specific value. This specific value is predetermined during laboratory calibration and is parameterized as a function of the non-piled-up pulses. Adjusting the pole-zero circuit to regulate pile-up counts to this parameterized function forces gamma spectral shapes, counting losses, and counting loss corrections to be consistent over temperature and between detector systems