“…The method currently under development at Sandia National Laboratories is generally referred to as the prompt-fission-neutron (PFN) technique. 2 Their probe contains a pulsed neutron generator that produces bursts of 14-MeV neutrons to interrogate the formation. At the probe the returning fission neutrons, which have slowed to the epithermal energy range, are detected by a cadmium-wrapped 3 He proportional counter.…”
“…The method currently under development at Sandia National Laboratories is generally referred to as the prompt-fission-neutron (PFN) technique. 2 Their probe contains a pulsed neutron generator that produces bursts of 14-MeV neutrons to interrogate the formation. At the probe the returning fission neutrons, which have slowed to the epithermal energy range, are detected by a cadmium-wrapped 3 He proportional counter.…”
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