Epithermal Neutron Porosity Measurement
A measurement based on the slowing down of neutrons between a source and one or more detectors that measure neutrons at the epithermal level (between approximately 0.4 and 10 eV). The slowing down process is dominated by hydrogen. By measuring neutrons at the epithermal rather than thermal level, the response is a purer estimate of hydrogen index, unaffected by thermal absorbers.
