Verification? with? gamma-ray? and ?fast ?neutron ?detection??

We?present?the?recent?results?of?our?development?effort?with?liquid?scintillators?at? Lawrence?Livermore?National?Laboratory.?Historically?we?developed?many?assay? analysis?techniques?specifically?for?relatively?low?efficiency?(a?few?percent)?neutron? measurement?systems?using?thermal?neutron?detectors,?mainly?helium-3,?taking? advantage?of?the?high?thermal?neutron?interaction?cross-sections.?Recently,? however,?we?have?been?investigating?fast?neutron?detection?with?liquid?scintillators? and?inorganic?crystals.?We?have?discovered?considerable?advantages?with?fast? neutron?detection?because?the?inherent?nanosecond?production?time-scales?of?fission?and?neutron-induced?fission?are?preserved?instead?of?being?lost?in?neutrothermalization?required?for?thermal?neutron?detectors.??