Pulse Shape Discrimination
PSD figure of merit, M, is defined as the separation between the
neutron and gamma peaks divided by the sum of the FWHM of the
neutron and gamma peaks at 1 MeV electron energy.
Measurements of 3.5 [ref. 3, Fig. 1] and 3.9
[Ref. 4, Fig. 6] have been reported. PSD figure of
merit, D, defined as the separation between neutron and gamma peaks
divided by the variance in the PSD signals at 1 MeV electron energy
is 11.3 [Ref. 3, Fig. 1].
For values of M and D at other energies and for electron rejection
ratios, see Figs. 3a, 3b, & 4 of Ref. 3 and Fig. 6
of Ref. 4.
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Response to Protons:
E=0.83P - 2.82 (1-exp(-0.25P E0.93) where P is the proton energy
in MeV and E is the electron energy in MeV that gives the same
light output in the range 1-300 MeV. [Ref. 5]
A more precise study in the energy range 5-17 MeV developed the
following relationship [Ref. 6].
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Neutron and Gamma Spectrometry
The absolute differential efficiency and neutron spectra for a
nominally 5 cm dia. x 5 cm cell for energiesbetween 0.2 and 22 MeV
are presented in reference 7.
Gamma spectra analysis at energies above 3 MeV taken with three
different sized scintillators is presented in Ref. 8.
Methods of analyzing neutron and gamma spectra are compared in
Ref. 9. Ee(MeV)=-1.092 + 0.5517Ep + 0.00461Ep²
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References
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1.
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F.T. Kuchnir & F.J. Lynch, "Time-Dependence of
Scintillators and the Effect on P.S.D.",
IEEE Trans. Nucl. Sci., NS-15, No. 3, (1968) 107-113
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2.
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J.B. Czirr, "The a/ß Ratio of Several Organic
Scintillators", Nucl. Instr. & Meth. 25 (1963) 106-108
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3.
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R.A. Winyard and G.W. McBeth, "Pulse Shape Discrimination in
Inorganic and Organic Scintillators",
Nucl. Instr. & Meth. 98 (1972) 525-533
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4.
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J.M. Adams and G. White, "A Versatile Shape Discriminator
for Charged Particle Seperation and its Application to Fas Neutron
Time-of Flight Spectroscopy", (<100 keV - 20 MeV),
Nucl. Instr. & Meth. 156 (1978) 459-476
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5.
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R.A. Cecil et al, "Improved Predictions of Neutron Detection
Efficiency for Hydrocarbon Scintillaotrs from 1 MeV - to about
300 MeV", Nucl. Instr. & Meth. 161 (1979) 439-447
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6.
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A. Aksoy et al, "Response-Function Measurements of an NE-213
Scintillator Using the 2H(d,n)3He Reaction",
Nucl. Instr. & Meth. In Phys. Res. (1994) 486-491
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7.
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V.V. Verbinski et al, "Calibration of an Organic Scintillaotr
for Neutron Spectrometry",
Nucl. Instr. & Meth. 65 (1968) 8-25
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8.
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L. Buermann et al, "Response of NE-213 Liquid Scintillation
Detectors to High-energy Photons (Eg>3 MeV)",
Nucl. Instr. & Meth. in Phys. Res. A332 (1993) 483-492
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9.
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R. Koohi-Fayegh et al, "Neural Network Unfolding of Photon
and Neutron Spectra Using and NE-213 Scintillation Detector",
Nucl. Instr. & Meth. In Phys. Res. A329 (1993) 269-276
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