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 log|induced spectral gamma-ray logs]].