CANEL EKE University of Huelva Akdeniz University Supervisors
- Slides: 13
CANEL EKE (University of Huelva) (Akdeniz University) Supervisors IVAN DIMITROV (University of Sofia)
La. Br 3 DETECTOR – Saint Gobain Crystals – Bril. Lan. Ce 380 La. Br 3 40 K
COMPARISON BETWEEN TWO DIFFERENT SCINTILATORS Ba. F 2 La. Br 3 137 Cs 17% 60 Co 3. 6% 60 Co
PREPARING THE EXPERIMENTAL SETUP CALIBRATE THE ENERGY Ø Use 60 Co Ø Use 152 Eu TESTING THE TIME RESOLUTION Ø Use 60 Co, instantaneus signal MAKE TIME MEASUREMENTS USING 152 Eu Ø First Start Signal Ø Second Start Signal
ADC 2 Delayed 2 >DELAYED 1 QAD TIMER Detector 2 STOP DELAY AND WITH CFD THRESHO LD 2 DELAY AND WITH COUNTER COINCIDENCE Detector 1 START CFD TAC THRESHO LD 1 STOP Delayed 1 ADC 3 START <DELAYED 2 ADC 1
ENERGY CALIBRATION 60 Co 3000 60 Co Spectra 2500 2000 1500 1000 500 0 1000 1100 1200 1300 1400 1500 1600 Energy [k
ENERGY RESOLUTION USING 60 Co and 152 Eu 20 18 16 14 Detector 2 12 Detector 1 10 Factory 8 6 4 2 0 0 200 400 600 800 1000 1200 1400 ENERGY [ke. V]
ENERGY CALIBRATION AND LINEARITY 60 Co and 152 Eu 6000 5000 y=4. 0242 x+168. 73 4000 3000 Detector 1 2000 Detector 2 y=3. 7455 x+78. 809 1000 0 0 200 400 600 800 1000 1200 1400 Energy [ke. V]
TIMING CALIBRATION USING 60 Co Fitting with a gaussian Ø Width is related to time resolution. Ø Factory time resolution is 0. 45 ns for La. Br 3 detector
MEASUREMENTS USING 152 Eu SOURCE STOP signal 121, 7 ke. V FIRST START signal 244. 7 ke. V We performed two experiments: two start transitions
TIMING MEASUREMENT 152 Eu (964 ke. V Start) 10 9 8 In(Counts) 7 6 5 4 3 2 1 0 28 N=N 0 e-λ*t In. N=In. N 0 - λt 33 38 In. N=- λt+In. N 0 y=a*t+b LITERATURE LIFE TIME=1. 44 ns TIME (ns) a=- λ` LIFE TIME OBTAINED=1. 37 ns
TIMING MEASUREMENT 152 Eu (244 ke. V Start) 140 5 4. 5 120 4 3. 5 100 3 80 2. 5 2 60 1. 5 40 1 0. 5 20 0 10 20 30 40 50 60 LITERATURE LIFE TIME=1. 44 ns 35 37 39 41 43 45 LIFE TIME OBTAINED=1. 52 ns Mean Value = (1, 52+1, 37)/2=1. 44 ns Variance = 0. 11 ns
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