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Energy resolution of NE102A and NE230 scintillators for monoenergetic gamma rays
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH
Nuclear Instruments and Methods in Physics Research A324 (1993) 223-225 North-Holland
Section A
Energy resolution of NE102A and NE230 scintillators for monoenergetic gamma rays A.A. Nagvi, F.Z. Khiari, A. Cvban and Abdulaziz M. Al-Jalal '
Energy Research Laboratory, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia Received 11 December 1991 and in revised form 30 July 1992
The energy resolution of 125 and 50 mm diameter cylindrical NE102A detectors and 25 mm x 19 mm (height x diameter) NE230(C6D6) deuterated scintillator has been measured for monoenergetic gamma rays with an energy of 0.5-1 .3 MeV. Over this energy range, the energy resolution of 125 mm NE102A detector varies from 22 .8 to 13 .2% and from 19 .6 to 11 .5% for the 50 mm NE102A detector. The measured energy resolution of the NE230 scintillator varies from 12.9 to 7.0% over the same energy range. The energy resolution of NE102A detectors and C6D6 scintillator is in good agreement with the energy resolution of NE213 detectors with comparable size .
The energy resolution of two NE102A plastic scintillators and a NE230 deuterated scintillator was measured for gamma rays with energies of 0.5-1 .3 MeV.
Table 2 Energy resolution data of NE230 scintillator and 38 mm diameter NE213 detector [2]
diameter while the other had a thickness of 50 mm and a diameter of 125 mm . The NE230 scintillator was
Electron energy [MeV]
AEI /E,[%] NE230 scintillator
NE213 detector [2]
0.341 0.477 0.639 0.903 1.062
12 .9+1 .5 9.2+_ 1 .1 8.8+11 .2 8.0+11 .3 7.1+1 .0
15 .5 13 .0 11 .3
One NE102A detector was 25 mm thick and 50 mm in
contained in a glass vial of VH1 type with a height of 25 .4 mm and a diameter of 19 mm . All the scintillators
were coupled to 52 mm diameter fast Thorn EMI photomultipliers model 9815B . The measurements were
carried out using the gamma-gamma coincidence tech-
nique described earlier [1]. In the present study a
9.5 8.7
distance of 70 mm was used for detector-monitor
separation . The energy resolution was measured using
1 ltCi
22
Na, 137Cs, 65 Zn and 54 Mn gamma ray sources.
Tables 1 and 2 show the corrected energy resolution Table 1 Energy resolution data of NE102A detectors and NE213 detectors [1]
data for the NE102A and NE230 scintillators, respectively. For the sake of comparison the energy resolu-
Electron energy [MeV]
Table 3 Resolution parameters of NE102A detectors and NE230 scintillator
0.341 0.477 0.639 0.903 1.062
AEc /E~ [%] for 50 mm diameter detectors
125 mm diameter detectors
NE102A
NE213 [11
NE102A
NE213 [11
19.6+0.7 0.7 0.3 156.+0.3 13 .3 ±0.7 11 .9+0.5 11 .5+0.7
.4 18 .8+00.4 .3 15 .6+00.3 13 .7+00.5 .5 11 .9_+0.4 12 .2+1 .0
22 .8+0 .5 19 .7+0 .3 16 .4+0 .6 14 .6+0 .7 13 .3+0 .7
24 .0+0 .5 18 .9+0 .2 0.3 16 .4+0 .3 14 .2+0 .4 13 .9+1 .5
1 Department of Physics, Massachusetts Institute of Technology, MA, USA.
Detector diameter
Present work
[mm]
a
NE213
detectors [1]
0
Y
a
0
50 mm NE102A 1 .5 125 mm NE102A 1 .5 25 mm X 19 mm NE230 1.5 (height X diameter)
10 .9+_ 0.2 13 .4+0 .2 7.0 +_ 0.4
0.2 0.2 0.2
1.2 1.5 1 .5 a
11 .0 0.2 13 .5 0.2 9.0 0.2
a Data is given for a 38 mm
x 38
from ref. [2].
0168-9002/93/$06.00 © 1993 - Elsevier Science Publishers B.V . All rights reserved
Y
mm NE213 detector taken
224
A.A . Nagvi et al. / Energy resolution of NE102A and NE230 scintdlators
tion data of NE213 detectors from refs . [1,2] has been included in tables 1 and 2, respectively . The energy resolution AE/E, of the 50 mm NE102A detector varies from 19 .6 to 11 .5% over the electron energy range of 0.341 to 1 .062 MeV. Over this energy range, Eh, the energy corresponding to the half height of the Compton edge is 12 .6-8.0% higher than E, the maximum energy of Compton electrons. Within statistical uncertainties, the energy resolution of 50 mm NE102A detector agrees with that of the 50 mm NE213 detector. Over the same electron energy range, the energy resolution of the 125 mm NE102A detector varies from 22 .8 to 13 .3% and its Eh is 20 .3 to 12 .5% higher than Ec. Due to its smaller volume, the 50 mm detector has better energy resolution than the 125 mm detector . Within statistical uncertainties the energy
resolution of the 125 mm NE102A detector also agrees with the energy resolution of the 125 mm NE213 detector . We have also made an empirical fit to the energy resolution data of both the NE102A and NE230 scintillator as a function of the electron energy, using the relation [1] 1/2. 0 E,/E, _ a z +,82 /E, +Y2 /E2 C Table 3 shows the values of the resolution parameters a, /3 and y for NE102A detectors along with the values for NE213 detectors [1]. Also shown in table 3 are the resolution parameters of the NE230 scintillator along with the resolution parameters of a 38 mm diameter NE213 detector taken from ref. [2]. Within statistical uncertainties, the values of /3 for 50 and 125 mm NE102 detectors agree well with those of NE213 detec-
Q r 12, w
Electron Energy (MeV)
Fig. 1 . Energy resolution (%) vs electron energies : (A) for 50 mm and ( ") 125 mm diameter NE102A detectors along with the empirical fit.
A.A. Nagoi et al. / Energy resolution of NE102A and NE230 scintillators
225
0 C O O O
tY
i
N C LU
Electron Energy (MeV)
Fig . 2. Energy resolution (%) vs electron energies for 25 mm x 19 mm NE230 (C 6 D6 ) deuterated scintillator along with the empirical fit .
tors . Due to the smaller volume the resolution parameters of NE230 scintillator are 29% smaller than the 38 mm NE213 detector . Figs . 1 and 2 show the energy resolution DE./E, as a function of the Compton electron energy Ec for the NE102A detectors and NE230 scintillator along with empirical fits . These tests provided useful data on energy resolution of NE102A and NE230 scintillators for monoenergetic gamma rays. Acknowledgement This work is part of KFUPM/RI Project ERL supported by the Research Institute of King Fahd University of Petroleum and Minerals .
References [1] A.A. Nagv6 H .A. Al 7uwair and K. Gul, Nucl . Instr. and Meth . A306 (1991) 267 . [2] G . Dietze and H . Klein, Nucl . Instr. and Meth . 193 (1982) 549 .
Nuclear Instruments and Methods in Physics Research A324 (1993) 223-225 North-Holland
Section A
Energy resolution of NE102A and NE230 scintillators for monoenergetic gamma rays A.A. Nagvi, F.Z. Khiari, A. Cvban and Abdulaziz M. Al-Jalal '
Energy Research Laboratory, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia Received 11 December 1991 and in revised form 30 July 1992
The energy resolution of 125 and 50 mm diameter cylindrical NE102A detectors and 25 mm x 19 mm (height x diameter) NE230(C6D6) deuterated scintillator has been measured for monoenergetic gamma rays with an energy of 0.5-1 .3 MeV. Over this energy range, the energy resolution of 125 mm NE102A detector varies from 22 .8 to 13 .2% and from 19 .6 to 11 .5% for the 50 mm NE102A detector. The measured energy resolution of the NE230 scintillator varies from 12.9 to 7.0% over the same energy range. The energy resolution of NE102A detectors and C6D6 scintillator is in good agreement with the energy resolution of NE213 detectors with comparable size .
The energy resolution of two NE102A plastic scintillators and a NE230 deuterated scintillator was measured for gamma rays with energies of 0.5-1 .3 MeV.
Table 2 Energy resolution data of NE230 scintillator and 38 mm diameter NE213 detector [2]
diameter while the other had a thickness of 50 mm and a diameter of 125 mm . The NE230 scintillator was
Electron energy [MeV]
AEI /E,[%] NE230 scintillator
NE213 detector [2]
0.341 0.477 0.639 0.903 1.062
12 .9+1 .5 9.2+_ 1 .1 8.8+11 .2 8.0+11 .3 7.1+1 .0
15 .5 13 .0 11 .3
One NE102A detector was 25 mm thick and 50 mm in
contained in a glass vial of VH1 type with a height of 25 .4 mm and a diameter of 19 mm . All the scintillators
were coupled to 52 mm diameter fast Thorn EMI photomultipliers model 9815B . The measurements were
carried out using the gamma-gamma coincidence tech-
nique described earlier [1]. In the present study a
9.5 8.7
distance of 70 mm was used for detector-monitor
separation . The energy resolution was measured using
1 ltCi
22
Na, 137Cs, 65 Zn and 54 Mn gamma ray sources.
Tables 1 and 2 show the corrected energy resolution Table 1 Energy resolution data of NE102A detectors and NE213 detectors [1]
data for the NE102A and NE230 scintillators, respectively. For the sake of comparison the energy resolu-
Electron energy [MeV]
Table 3 Resolution parameters of NE102A detectors and NE230 scintillator
0.341 0.477 0.639 0.903 1.062
AEc /E~ [%] for 50 mm diameter detectors
125 mm diameter detectors
NE102A
NE213 [11
NE102A
NE213 [11
19.6+0.7 0.7 0.3 156.+0.3 13 .3 ±0.7 11 .9+0.5 11 .5+0.7
.4 18 .8+00.4 .3 15 .6+00.3 13 .7+00.5 .5 11 .9_+0.4 12 .2+1 .0
22 .8+0 .5 19 .7+0 .3 16 .4+0 .6 14 .6+0 .7 13 .3+0 .7
24 .0+0 .5 18 .9+0 .2 0.3 16 .4+0 .3 14 .2+0 .4 13 .9+1 .5
1 Department of Physics, Massachusetts Institute of Technology, MA, USA.
Detector diameter
Present work
[mm]
a
NE213
detectors [1]
0
Y
a
0
50 mm NE102A 1 .5 125 mm NE102A 1 .5 25 mm X 19 mm NE230 1.5 (height X diameter)
10 .9+_ 0.2 13 .4+0 .2 7.0 +_ 0.4
0.2 0.2 0.2
1.2 1.5 1 .5 a
11 .0 0.2 13 .5 0.2 9.0 0.2
a Data is given for a 38 mm
x 38
from ref. [2].
0168-9002/93/$06.00 © 1993 - Elsevier Science Publishers B.V . All rights reserved
Y
mm NE213 detector taken
224
A.A . Nagvi et al. / Energy resolution of NE102A and NE230 scintdlators
tion data of NE213 detectors from refs . [1,2] has been included in tables 1 and 2, respectively . The energy resolution AE/E, of the 50 mm NE102A detector varies from 19 .6 to 11 .5% over the electron energy range of 0.341 to 1 .062 MeV. Over this energy range, Eh, the energy corresponding to the half height of the Compton edge is 12 .6-8.0% higher than E, the maximum energy of Compton electrons. Within statistical uncertainties, the energy resolution of 50 mm NE102A detector agrees with that of the 50 mm NE213 detector. Over the same electron energy range, the energy resolution of the 125 mm NE102A detector varies from 22 .8 to 13 .3% and its Eh is 20 .3 to 12 .5% higher than Ec. Due to its smaller volume, the 50 mm detector has better energy resolution than the 125 mm detector . Within statistical uncertainties the energy
resolution of the 125 mm NE102A detector also agrees with the energy resolution of the 125 mm NE213 detector . We have also made an empirical fit to the energy resolution data of both the NE102A and NE230 scintillator as a function of the electron energy, using the relation [1] 1/2. 0 E,/E, _ a z +,82 /E, +Y2 /E2 C Table 3 shows the values of the resolution parameters a, /3 and y for NE102A detectors along with the values for NE213 detectors [1]. Also shown in table 3 are the resolution parameters of the NE230 scintillator along with the resolution parameters of a 38 mm diameter NE213 detector taken from ref. [2]. Within statistical uncertainties, the values of /3 for 50 and 125 mm NE102 detectors agree well with those of NE213 detec-
Q r 12, w
Electron Energy (MeV)
Fig. 1 . Energy resolution (%) vs electron energies : (A) for 50 mm and ( ") 125 mm diameter NE102A detectors along with the empirical fit.
A.A. Nagoi et al. / Energy resolution of NE102A and NE230 scintillators
225
0 C O O O
tY
i
N C LU
Electron Energy (MeV)
Fig . 2. Energy resolution (%) vs electron energies for 25 mm x 19 mm NE230 (C 6 D6 ) deuterated scintillator along with the empirical fit .
tors . Due to the smaller volume the resolution parameters of NE230 scintillator are 29% smaller than the 38 mm NE213 detector . Figs . 1 and 2 show the energy resolution DE./E, as a function of the Compton electron energy Ec for the NE102A detectors and NE230 scintillator along with empirical fits . These tests provided useful data on energy resolution of NE102A and NE230 scintillators for monoenergetic gamma rays. Acknowledgement This work is part of KFUPM/RI Project ERL supported by the Research Institute of King Fahd University of Petroleum and Minerals .
References [1] A.A. Nagv6 H .A. Al 7uwair and K. Gul, Nucl . Instr. and Meth . A306 (1991) 267 . [2] G . Dietze and H . Klein, Nucl . Instr. and Meth . 193 (1982) 549 .