SIMULATION OF NEUTRON RESPONSE FUNCTIONS OF SILICON SENSOR APPLIED TO REAL-TIME PERSONAL ALBEDO NEUTRON DOSEMETER IN THE ENERGY RANGE BETWEEN 0.01 EV AND 10 KEV

Neutron response functions of a silicon sensor, which is applied to a new real-time personal albedo neutron dosemeter, have been simulated for low energy neutrons from 0.01 eV to 10 keV using the Monte Carlo technique. The angular neutron response functions were obtained by multiplying simulated neutron energy spectra crossing the neutron sensor and the cross-section of the Li-6(n,t)He-4 reaction. The neutron response functions have been closed to the dose conversion coefficient of personal doses, Hp(10) recommended by the International Commission on Radiological Protection by selecting neutrons incident from angles of 105 degrees to 180 degrees with respect to an axis perpendicular to an acrylic phantom surface. From these simulation results, the neutron energy response function has been improved by shielding the sensor with cadmium box without a face toward the phantom. The neutron sensor provides a good conformance to the Hp(10) conversion coefficients within 15% for low energy neutrons.