We have done simulation studies of the neutron shielding for a 252Cf source using GEANT4. For the energy distribution of the neutrons emitted from 252Cf, we have assumed the Watt fis-sion spectrum. The neutron absorption dose rates with and without the shield are estimated for three different materials of Type 304 SS, NS-4-FR and Resin-F. Among various physics models of GEANT4 for the hadronic interactions of low-energy neutrons, we have used the High Precision (HP) model, which is based on the ENDF-VI data and is able to treat elastic, inelastic, fusion and fission processes for neutrons. We have investigated the accuracy of this HP model of GEANT4 by comparing the simulation results with those from MCNP5 and experimental data.