BC-454 Natural Boron-loaded Premium Plastic Scintillator General Description BC-454 is a boron-loaded, plastic scintillator formulated to provide efficient detection of fast and slow neutrons. The standard material contains natural boron (19.9% 10B) at a concentration of 5% by weight. Low energy neutrons are detected through the 10B (n, d) capture reaction, and high energy neutrons are detected via elastic scattering of protons. The principal application of this material is total-absorption neutron spectrometry. A fast neutron will produce a prompt recoil proton pulse. Neutrons that are sufficiently thermalized within the scintillator are likely to undergo the 10B (n,d) capture. A capture pulse, in delayed coincidence with the prompt pulse, is used to identify neutron events. For neutron energies below 200keV, the capture time constant is dependent only on the 10B concentration. For a 5% boron loading, the capture time constant is approximately 2.7 microseconds. BC-454 is available as sheets, rods, thin films and fibers. Other boron concentrations up to 15% are available on request. General Techincal Data Base Polyvinyltoluene Density 1.026 g/cm3 Refractive Index 1.58 Coefficient of Linear Expansion 7.8 X 10-5, below 65°C Vapor Pressure May be used in vacuum Solubility Soluble in aromatic solvents chlorinated solvents, acetone, etc. Unaffected by water, dilute acids, lower alcohols, alkalis and pure silicone fluids or grease. Physical Constants % Boron Loading 1% 5% 10% Light Output % Anthracene 60 48 38 Decay Time, ns 2.2 2.2 2.2 Wavelength of Max. Emission, nm 425 425 425 No. of C atoms per cm3 (x 1022) 4.63 4.43 4.18 No. of H atoms per cm3 (x1022) 5.18 5.18 5.18 No of 10B atoms per cm3 (x 1020) 1.12 5.59 11.25 No. of electrons per cm3 (x1023) 3.34 3.33 3.32 References L.W. Bollinger and G.E. Thomas, Rev. Sci. Instrum., 28, 489-496 (1957) Von L. Sutterlin, Atomkernenergie, Vol. 12, NO. 7/8, 287, 228 (1967) L.R. Greenwood and N.R. Chellew, Rev. Sci. Instrum., 50 (4), 466-471 (April, 1979) D.M. Drake, et al, Nucl. Instr. & Methods in Physics Res., A274, 576 (1986) [ Cast plastic scintillators ] Organic Products | Inorganic Scintillation Products | Crystal Products Bicron RMP | Optics and Oxides | Crismatec | Product Search/Faq Company Profile | News | Contact Us | NE Technology | Home