Abstract
Neutron source characteristics, especially the spatial distribution and time variation, in electron synchrotron facilities are very complicated and can’t be well identified. The purpose of this study intends to evaluate the neutron source characteristics through the experimental measurements carried out outside the shielding wall, with a special emphasis on the angular distribution emerged from the shielding wall surface and locations of the neutron hot spots. A high-efficiency eight-channel neutron detector (8CND) had been designed to characterize the angular or energy information of the neutron field. The 8CND consists of eight BF 3 tubes and a polyethylene cylinder. The response function of each of the BF 3 tubes in the 8CND was examined in detail by using the Monte Carlo simulation. Based on the high-efficiency and distinct response function of each BF 3 tube in the 8CND, it had demonstrated that some valuable information about the neutron field could be extracted from the counting rates of these eight BF 3 tubes in the 8CND. © 2014 Atomic Energy Society of Japan. All rights reserved.