Study on Structure of Wide Energy Range Neutron Rem Counter

The energy response of the wide energy range neutron rem counter was calculated using the MCNP and FLUKA code,when the structure was changed.The result was compared with the standard curve of ICRP.The calculation results show that the energy response of conventional A-B neutron rem counter was improved greatly as a result of joining lead layer,which was affected by collocation and thickness of lead layer.The energy response of rem counter with single lead layer is better than the double layers.The energy response curve of rem counter agrees wellwith the standard curve of ICRP when the collocation of the lead layer is inside of rem counter and its thickness is 0.4cm.