Measurement of light yield of Ce3+ perturbed emission of CaF2 scintillator coupled with avalanche photodiode

The present work describes the first detailed gamma-ray responses of Ce³⁺ perturbed emission in CaF2 host. Ce³⁺ 1%, 3%, 5%, 10%, and 20% doped single crystalline CaF2 scintillators were grown by μ-PD method. Their transmittance were measured by JASCO V550 spectrometer, and about 80% transparence was achieved. All the sample showed an emission peak around 330 nm, which was Ce³⁺ perturbed emission, when they were irradiated by 1GBq ¹³⁷Cs and read out by CCD. Absolute lihjt yield (ph/MeV) was measured by Si-APD (S8664-55, Hamamatsu), and the 3% sample showed the highest light yield around 900 ph/MeV with 2 μs shaping time. The decay time was measured by FLS900 (Edinburgh instrument), and about 40 ns decay was observed.