Abstract
Forward and lateral radiation outside the TPS LINAC room during a full power beam commissioning were measured and compared with Monte Carlo predictions. Several high-sensitivity radiation detectors were used in this study to identify possibly increases of radiation above background level. Response functions of three different neutron detectors to both neutrons and high-energy gamma rays were calculated using MCNPX with continuous-energy cross sections. Neutron and gamma-ray spectra at the locations of measurement were estimated by FLUKA simulations. By folding the calculated spectra with detector response functions, we found that the calculated results are generally consistent with the measurements. However, some slight difference may hide some faults resulting from the simulation processes and the experiment methods. This paper presents the features of these detectors and an in-depth discussion on the neutron detector responses in this experiment. Although high-energy neutrons (>10 MeV) are negligible for electron accelerators in this energy range, photoneutrons caused by interactions of high-energy gamma rays with the detector itself could be a significant contribution to the total response, especially when using a metal-embedded neutron detector at an environment with high-energy gamma rays.