To characterize the high energy neutron production from an LiD plate constructed at Texas A&M University, measurements and calculations were performed. Two types of measurements were used to substantiate the high energy neutron flux. One used an NE-213 detector system to measure the high energy neutron production from the LiD plate and the other employed foil activation to measure the neutron flux entering the irradiation cell. A new code, FERDNA, was produced by not only converting the original unfolding FERD code to Microsoft FORTRAN but also embellishing the code with several subroutines to perform integration over energy ranges specified by the user. Raw pulse-height distributions from an NE-213 detector were directly transferred from an MCA to a MacIntosh where FERDNA was executed. The LiD plate was designed and constructed by considering (1) neutron production due to 6Li(n, α) 3T reactions and subsequent T-D or T-Li fusion as the tritons slow down and (2) the escape probability of tritons from the LiD material. This allowed the needed 6Li enrichment and thickness of the plate to be selected. The number of high energy neutrons produced per thermal neutron incident upon the LiD plate was measured as 1.03×10 -4±8.5% n/n th.