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PULSED NEUTRON DECAY TOOL FOR MEASURING GAMMA RADIATION ENERGY SPECTRA FOR FAST NEUTRON INELASTIC COLLISIONS AND THERMAL NEUTRON CAPTURE EVENTS
PULSED NEUTRON DECAY TOOL FOR MEASURING GAMMA RADIATION ENERGY SPECTRA FOR FAST NEUTRON INELASTIC COLLISIONS AND THERMAL NEUTRON CAPTURE EVENTS
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机译：脉冲中子衰变工具，用于测量快速中子非弹性碰撞和热中子捕获事件的伽马辐射能谱
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摘要
A well logging tool in accordance with the presentinvention is provided for emitting neutron bursts, anddetermining inelastic energy spectra and thermal neutroncapture cross sections during a single logging pass over awell depth interval. Inelastic energy spectra are determined,in part, by measuring exponential decay rates for thermalneutrons capture events that occur during decay periods whichextend for at least several thermal neutron lifetimesfollowing each of the neutron bursts, and by using themeasured exponential decay rates to project from thermalneutron capture spectra detected during the decay periods avalue for thermal neutron capture components of the totalenergy spectra detected during neutron burst periods.
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