Gd2SiO5(Ce3+) and BaF2 measured electron and photon responses

Gd2SiO5(Ce3+) (GSO) and BaF2 electron responses were measured using the Compton Coincidence Technique (CCT). The CCT has previously been used to characterize several scintillators and has proven to be an accurate and reliable technique. The measured GSO electron response was observed to increase by 28% as the electron energy increased from 5 to 445 keV. The measured BaF2 electron response increased 23% as the electron energy increased from 18 to 436 keV. Both electron responses become linear at higher electron energies (above about 200 keV). These observations made with GSO and BaF2 in this study are consistent with the general trend reported for previous CCT characterized non-alkali halide scintillators. To validate the GSO and BaF2 measured electron responses, respective photon responses were calculated and subsequently compared to measured photon response data. MCNP4C together with simplified electron cascade sequences for GSO and BaF2 were used in these photon responses calculations. Calculated photon responses for both crystals are in good agreement (within 10%) with measured photon responses. This agreement confirms the accuracy of the GSO and BaF2 measured electron responses.