Two-Dimensional Radiation Field Map of a Be-based Source

Sammanfattning: The aim of this project was to measure the profile of the radiation exiting an aperture of the Aquarium at the Source Testing Facility at the Division of Nuclear Physics at Lund University. So far, the outgoing beam of radiation at the aperture of the Aquarium has been assumed to be uniform. The radiation is produced by a Beryllium-based radioactive source and comes in the form of neutrons and γ-rays. Thermal neutrons were detected using a 3He proportional counter and γ-rays were detected using a Cerium-Activated Lanthanum Bromide scintillation detector. To form a two-dimensional map of the radiation, the detectors were placed at several different well-defined positions. The data obtained in the measurements that were performed showed that the intensity of radiation indeed varies across the different positions. The ultimate goal of the project to which this thesis contributes is to create a simulation framework that provides a map of the radiation profile at the aperture of the Aquarium. This will facilitate precision studies of newly developed detector responses in the future.