Notes on The accuracy of the Neutron Lifetime Measurement


P. A. Wichmann, Dresser Atlas

4th Formation Evaluation
Symposium of the Canadian Well Logging Society in Calgary, May 9-10,



INTRODUCTION During the past several years a number of papers have been published which point out that the most well-known commercial logging devices for the measurement of the thermal neutron capture cross section do not always agree in the absolute values measured. There are a number of reasons for these discrepancies, including different philoso- phies in tool design, gating systems and types of detectors.