FET voltage follower 数字示波器 Wavepro 960 BaF2 28中×10 trigger Y-ray 米 source PMT1 GPIB BaF2 disc. disc. disc. 28中×20 计算机 coincidence The time range of the oscilloscope is set to 100 ns.Data are transferred to a personal computer through a GPIB.The maximum transfer rate is about 300 kByte/s. e e
T h e t i m e r a n g e o f t h e o s c i l l o s c o p e i s s e t t o 1 0 0 n s. D a t a a r e t r a n s fe r r e d t o a p e r s o n a l c o m p u t e r t h r o u g h a G P I B. T h e m a x i m u m t r a n s fe r r a t e i s a b o u t 3 0 0 k B y t e/ s
2-gamma system At Tstop -Tstart =TCF(PMT2,0.511 MeV) TCF(PMT1,1.27 MeV) where TCF is the time at which the pulse crosses the constant fraction of 25%of the amplitude. e
2-gamma system where TCF is the time at which the pulse crosses the constant fraction of 25% of the amplitude
3-gamma system △t=Tstop-Tstart Tstop =[TCF(PMT2,0.511 MeV) where TcF(PMT3,0.511 Mev)]/2 Tstart TCF(PMT1,1.27 Mev) e
3-gamma system where
In addition only those events that satisfy TCF(PMT2,0.511 MeV) -TcF(PMT3,0.511 MeV)<400 ps are accepted
Time response 标定源： 60Co(1.33MeV,1.17MeV), 207Bi(1.064MeV,0.570MeV) 22Na(0.511MeV,0.511MeV) At TCF(pulse 2)-TCF(pulse 1)
Time response ᷛᅮ⑤: 60Co (1.33 MeV, 1.17 MeV), 207Bi (1.064 MeV, 0.570 MeV), 22Na(0.511MeV, 0.511 MeV)