High-speed pulse height analyzer for downhole spectroscopic applications

The advent of new, faster scintillation materials with high intrinsic spectral resolution requires new acquisition systems with higher throughput, minimal spectral distortion, excellent pulse height resolution and optimal pile-up rejection. The pulse height analyzer (PHA) converts the analog detector pulse into a digital signal that can be stored in a pulse height histogram. A new PHA system is used in conjunction with a LaBr detector and a high performance d-T neutron generator at instantaneous count rates exceeding 2 MHz at temperatures as high as 175°C in downhole oil well logging.