HIGN SENSITIVITY NEUTRON REM COUNTER

The constructions of two counters (NR1 and NR2) and their characteristicsare presented. In the region from thermal energy to 17 MeV, the detectable doseequivalent values range from 10~(-4) to 10~2 mrem·h~(-1) and the neutron doseequivalent sensitivity is approximately 140 cps/mrem·h~(-1) for the counter NR1;the detectable dose equivalent values range from 10~(-4) to 65 mrem·h~(-1) and the doseequivalent sensitivity～209 cps/mrem·h~(-1) for the counter NR2 in the energy rangefrom thermal to 7 MeV. Compared with the rem counter SIUDSVIK 2202D, theirdose equivalent readings are consistent within ±10% when neutron beams areapproximatly perpendicular to the counter axis.