eng Science and Education Publishing International Journal of Physics 2333-4576 2019-09-15 7 2 63 65 10.12691/ijp-7-2-5 IJP2019725 article Jeremiah Monari Kebwaro jeremiahkebwaro@gmail.com 1 Department of physical sciences Karatina University, P.O Box 1957-10101, Karatina Kenya The effect of cross-sectional data discrepancies on the effectiveness of radiation shielding design has been investigated in this paper. The MCNP code with cross-sections from ENDF/B-V and ENDF/B-VII has been used to determine the gamma ray dose equivalent, H*(10), behind a lead glass shield enclosing a slow neutron source. It is observed that the radiative capture gamma ray dose behind the shield is higher when ENDF/B-V cross-sections are used compared to that produced by ENDF/B-VII cross-sections. The discrepancy is due to absence of energetic primary gamma rays when ENDF/B-VII is used. The results show that shielding design using ENDF/B-VII cross-sections could underestimate the shield by a fair margin and compromise safety. It is therefore necessary to consider more than one release of ENDF/B when using lead glass for shielding slow neutron capture gamma rays. The discrepancies need to be addressed in the next releases. http://pubs.sciepub.com/ijp/7/2/5/ijp-7-2-5.pdf lead glass shielded dose MCNP ENDF cross-sections discrepancies