[en] Shields around core and blankets form major part of reactor assembly in fast reactors. The spectrum of neutrons leaking from the blankets is hard with negligible thermal component and has anisotropic angular distribution. Boron carbide and stainless steel have been the main choice shield materials for shields in fast reactors. Kalpakkam MINI (KAMINI) reactor beam was used to measure attenuation of the threshold inelastic (n,n') reaction rates on Cd-111, In-115 and Rh-103 in Boron carbide. Shield. KAMINI reactor including beam hole and shield was modeled and Monte Carlo calculations carried out using the code (MCNP). The details of experimental measurements and MCNP calculations are presented. Comparison of MCNP predicted attenuation behaviour with measured attenuation pattern is made. The values are in fairly good agreement It is also observed that the predicted values are lower in all the cases. (authors)