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Current Joint Test Assembly (JTA) neutron monitors rely on knock-on proton type detectors that are susceptible to X-rays and low energy gamma rays. We investigated two novel plastic scintillating fiber directional neutron detector prototypes . One prototype used a fiber selected such that the fiber width was less than 2 .1mm which is the range of a proton in plastic . The difference in the distribution of recoil proton energy deposited in the fiber was used to determine the incident neutrondoi:10.2172/875616 fatcat:s6ljvuqcr5gxlhdhb4luhd4lga