Plastic Scintillators

Plastic scintillators are organic scintillators that contain fluorescent emitters (i.e. “fluors”) suspended in a solid polymer base. Plastic scintillators are typically made by dissolving the fluor into the monomer prior to bulk polymerization. The main advantages of plastic scintillators over many other organic and inorganic scintillators is that they are very rugged and can be made in any shape and size. They typically have light yields on the order of 10,000 ph/MeV and have a fast scintillation decay on the order of 1 to 10 ns. The emission wavelength can vary from 400 to 600 nm, depending on the fluor used.

Technologies:

Dual-Mode Plastic Scintillators 

RMD’s dual-mode plastic scintillators can be used for gross counting, but offer the additional benefit of providing neutron/gamma pulse shape discrimination (PSD). RMD’s dual-mode plastic scintillators have a density of 1.10 g/cm3. The light yield is of the order of 10,000 ph/MeV, depending on the size of the plastic scintillator. The emission wavelength is at 425 nm with a decay time of 10 ns. The Figure of Merit for neutron/gamma PSD typically is > 1.5 at 1 MeVee. RMD’s dual-mode plastic scintillators are available in sizes of up to 5” right cylinders and slabs of up to 6” x 6” x 3”. Other sizes may be available upon request. The operating temperature range for RMD’s dual-mode plastic scintillators should not exceed 150°C.

Dual-Mode Plastic Scintillators Dual-Mode Plastic Scintillators

 

Triple-Mode Plastic Scintillators

RMD’s triple-mode plastic scintillators offer the same characteristics as RMD’s dual-mode plastic scintillators, but with the added benefit of providing gamma-ray spectroscopy. As such, RMD’s triple-mode plastic scintillators are the first low-cost, practical neutron/gamma scintillation detector for use as a replacement for both medium resolution gamma-ray detectors and Helium-3/Helium-4 proportional counter tubes for (thermal/fast) neutron detection.

RMD’s triple-mode plastic scintillators have a density of 1.15 g/cm3 and an effective Z of about 33. The light yield is of the order of 10,000 ph/MeV, depending on the size of the plastic scintillator. The energy resolution typically is about 10% (FWHM) at 662 keV. The emission wavelength is at 440 nm with a decay time of 10 ns. The Figure of Merit for neutron/gamma PSD typically is > 1.5 at 1 MeVee. RMD’s triple-mode plastic scintillators are available in sizes of up to 3” right cylinders. Other sizes may be available upon request. The operating temperature range for RMD’s triple-mode plastic scintillators should not exceed 200°C.

Triple Mode Plastic Scintillators

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