Emission wavelength and gamma-ray response of APD for Lu/sub 0.4/Gd/sub 1.6/SiO/sub 5/:Ce

Emission spectra for X-ray and UV excitation, decay curve for emission above 460 nm under gamma ray excitation and energy spectrum for excitation with /sup 137/Cs gamma rays have been measured for Lu/sub 0.4/Gd/sub 1.6/SiO/sub 5/ having 2.0 mol% Ce. The emission spectrum shows two peaks around 430 and 495 nm. The excitation-emission spectrum under UV excitation also has two peaks at 425 and 510 nm for excitation at 285 and 385 nm, respectively. No significant difference in decay constants between entire emission and above 460 nm emissions. Energy resolution obtained from the energy spectrum is 8.0% for /sup 137/Cs gamma-ray excitation.