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BC-501A
Liquid Scintillator
General Description
BC-501A is formulated to yield excellent PSD properties for neutron-gamma discrimination (ref. 1). Bicron most often supplies BC-501A encapsulated in metal or glass cells ready for immediate use. The most common cells are the bubble-free type MAB-1 cell or the type MVB-1 cell which has a bubble in it. Both are made of aluminum and can be provided complete with photomultipliers and voltage dividers appropriate for PSD work.
The scintillator is also supplied in bottles, deoxygenated and sealed under inert nitrogen gas. When the liquid is transferred to the user's cell, it must be newly deoxygenated, usually by purging with pure nitrogen or argon gas for at least 15 minutes immediately before sealing the cell, in order to assure good PSD performance.
Properties
| Light Output |
78 % anthracene |
| Wavelength of Maximum emission |
425 nm |
| Density |
0.874 g/cm3 |
| Flash point, T.O.C. |
26°C |
| Refractive index, nD |
1.505 |
| Refractive index at 425 nm |
1.530 |
| Decay time (short component) |
3.2 nsec |
| Mean decay times of first three components (ref.2) |
3.16, 32.3 & 270 ns |
| Mean life time for energy transfer from solvent to solute (ref. 2) |
1.66 ns |
| No. of photoelectrons/keV energy loss using Burle-8575 phototube (ref. 2) |
1.7 |
| Alpha/beta ratio, "fast" (ref. 3) |
0.073 |
| Alpha/beta ratio, "slow" (ref. 3) |
0.098 |
Response to protons:
E = 0.83P - 282 [1 - exp (- 0.25P0.93)]
where P is the proton energy in MeV, and E is the electron energy in MeV that gives the same light output (ref. 4).
Fig. 25 of ref. 5 indicates the light output vs. initial kinetic energy of protons.
Atomic Composition
| H/C (atomic ratio) |
1.212 |
| No. of H atoms per cc |
4.82 x 1022 |
| No. of C atoms per cc |
3.98 x 1022 |
| No of electrons per cc |
2.87 x 1023 |
Emission Spectrum
References
- "Comparison of the Scintillators BC-501 and NE 213", C.A.Goulding et al, LANL Technical Note LA-N2TN-87-201, April 1987.
- "Time-Dependence of Scintillators and the Effect on P.S.D.," F.T. Kuchnir & F.J. Lynch, IEEE Trans. Nucl. Sci., NS-15, No. 3, 107-113 (1968)
- "The Alpha/Beta Ratio of Several Organic Scintillators", J.B. Czirr, Nucl. Instr. & Meth., 25, 106-108 (1963)
- "Improved Predictions of Neutron Detection Efficiency for Hydrocarbon Scintillators from 1 MeV to About 300 MeV", R.A. Cecil et al, Nucl. Instr. & Meth., 161, 439-447 (1979)
- R. Katz et al, Nucl. Instr. & Meth., 100, 13-32 (1972)
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