Dm. Kondratiev et al., SCINTILLATION IN CERIUM-ACTIVATED GADOLINIUM-BASED CRYSTALS, Physica status solidi. b, Basic research, 197(1), 1996, pp. 251-258
Scintillation in cerium-doped gadolinium-based crystals results from t
he energy transfer of excited host matrix Gd3+ ions (I-6(7/2,11/2);(6)
P-7/2,P-5/2) to the Ce3+ ions {5d(1)(T-2(2))} which radiatively relax
to the ground state.