Development of reconstruction algorithm for activation sample measurement using gamma camera

In a facility using neutron, it is important to figure out the spatial distribution of the neutron beam. To get neutron spatial distributions, multiple activation foils are used in the activation foil method. To measure the radioactivity of foils efficiently, a novel measurement system with gamma camera was proposed. The radioactivity of foils was obtained as the image form in the system. To determine the radioactivity of each foil, reconstruction algorithm was necessary. In this study, a novel reconstruction algorithm suitable to the proposed system was developed. The algorithm was validated by solving two problems. By utilizing the developed algorithm, accurate determination of radioactivity of multiple foils was possible. It is expected that the developed algorithm could be used for the efficient measurement of neutron beam distribution.