SPWLA Glossary

A term with broad application. Includes all logs made while using neutron bursts or pulses. This term quite often is used in referring to neutron decay time logs such as the Thermal Decay Time Log, Neutron Lifetime Log, and Thermal Multigate Decay Log. A neutron generator, which emits neutrons in controlled cyclic pulses, is the source of radiation. The term also applies to other nuclear logs where cyclic neutron pulses must be used; e.g., some induced spectral gamma-ray logs.