《Table 1 Comparison of performance parameters among several Rem-meters》

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《宽能区中子雷姆仪初步设计》

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In order to improve the accuracy of dose equivalent measurement around some stray radiation fields at high energy accelerators，the energy response of the wide energy range neutron Rem counter with different structures was calculated using the MCNPX code，based on the domestic and overseas investigations of wide energy range neutron Rem counter in the field of radiation protection.The results were compared with the standard curve of ICRP（Fig.1），and the performance parameters were compared with the available products and literature suggests，such as ambient dose equivalent H*（10）response and operability（Table 1）.Then a set of optimized detector parameters were established.The results show that the response of modified Remmeter well corresponds to the standard curve of ICRP in the high energy neutron radiation fields，the detector includes a spherical 3 He proportional counter with 2atmospheres，apolyethylene moderator with the thickness of 3.75cm，a cadmium absorber with the thickness of 1 mm and the poriness of 20.3%，a lead layer with the thickness of 0.6cm and a polyethylene moderator with the thickness of 6.0cm，from inner to out.Its sensitivity ranges from thermal energy up to5GeV.