Blue enhanced large area avalanche photodiodes in scintillation detection with LSO, YAP and LuAP crystals

Scintillation detectors consisting of LSO, LuAP and YAP crystals fitted to bevelled-edge large area avalanche photodiodes of 10 mm in diameter characterised by a high quantum efficiency up to 68% at 350 nm wavelength were studied. Among the properties measured were the number of electron-hole pairs, energy resolution and noise contribution of the LAAPDs at shaping time constants down to 20 ns at different gains. High electron-hole pair numbers of 11000/spl plusmn/550 e-h/MeV and 19500/spl plusmn/980 e-h/MeV for the YAP and LSO crystals were measured, respectively. The energy resolution for /sup 137/Cs /spl gamma/-rays of 5.9% in FWHM for the YAP crystal, much better than that of 9.9% for the LSO crystal were measured at 0.5 /spl mu/s shaping time constant and the APD gain of 40. The same study done with a fast shaping of 20 ns and the APD gain of 160 showed the energy resolution of 6.7%.

[1]  K. Kurashige,et al.  Monte Carlo simulation of scintillator efficiency for GSO single crystal , 1995, 1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record.

[2]  R. Baertsch.  Low-frequency noise measurements in silicon avalanche photodiodes , 1966 .

[3]  M. Moszynski,et al.  Properties of the YAG:Ce scintillator , 1994 .

[4]  Eiji Sakai,et al.  Recent Measurements on Scintillator-Photodetector Systems , 1987, IEEE Transactions on Nuclear Science.

[5]  G. Eigen,et al.  Photodiode readout for scintillating crystals of BGO and Nal(Tl) , 1982 .

[6]  M. Moszynski,et al.  Advantages and limitations of LSO scintillator in nuclear physics experiments , 1995 .

[7]  P. Dorenbos,et al.  Absolute light yield measurements on BaF/sub 2/ crystals and the quantum efficiency of several photomultiplier tubes , 1992 .

[8]  Non-linear Response In The Scintillation Yield Of Lu/sub 2/ SiO/sub 5/ O:Ce/sup 3+/ , 1993 .

[9]  H. Tawara,et al.  Numbers of scintillation photons produced in NaI(Tl) and plastic scintillator by gamma-rays , 1993 .

[10]  J. Rogers,et al.  Characteristics of the new YAlO3 compared to BGO and GSO , 1991, Conference Record of the 1991 IEEE Nuclear Science Symposium and Medical Imaging Conference.

[11]  M. Moszynski,et al.  TIMING PROPERTIES OF BGO SCINTILLATOR , 1981 .

[12]  Calvin E. Moss,et al.  Temperature dependence of CsI (T1) absolute scintillation yield , 1993, IEEE Transactions on Nuclear Science.

[13]  M. Balcerzyk,et al.  LuAlO/sub 3/:Ce and other aluminate scintillators , 1995 .

[14]  D. Wolski,et al.  Properties of the new LuAP:Ce scintillator , 1997 .

[15]  S. Kubota,et al.  Cerium doped GSO scintillators and its application to position sensitive detectors , 1989 .

[16]  A. Yamamoto,et al.  A low-momentum π-μ channel at the KEK 12 GeV proton synchrotron , 1981 .

[17]  D. Wolski,et al.  Properties of the YAP : Ce scintillator , 1998 .

[18]  C. Melcher,et al.  Cerium-doped lutetium oxyorthosilicate: a fast, efficient new scintillator , 1991, Conference Record of the 1991 IEEE Nuclear Science Symposium and Medical Imaging Conference.

[19]  G. Mageras,et al.  A measurement of the light yield of common inorganic scintillators , 1988 .

[20]  N. Mistry,et al.  The use of silicon photodiodes in a CsI(Tl) calorimeter , 1985 .

[21]  R. Bell,et al.  Direct measurement of the primary photoelectron yield in sodium iodide scintillation counters , 1968 .

[22]  R. Allemand,et al.  Barium fluoride — Inorganic scintillator for subnanosecond timing , 1983 .

[23]  Dieter Renker,et al.  Some studies of avalanche photodiode readout of fast scintillators , 1995 .