NON-FOGGING PLASTIC SCINTILLATORS

EJ-200NF & EJ-208NF

Eljen now offers new non-fogging versions of our workhorse EJ-200 and EJ-208 plastic scintillators. In collaboration with four US national laboratories, we have developed EJ-200NF and EJ-208NF for use in radiation detector systems for border security and industrial/health physics applications. These scintillators are specifically designed for outdoor detector systems and can withstand the stresses of large temperature variations and moisture absorption that eventually lead to fogging and reduced detector performance in conventional plastic scintillators.

Click here to read more about these products and our collaboration.

PRODUCTS

Plastic Scintillators
Available in a wide variety of sizes and geometries, machined to customer specifications.

Liquid Scintillators
Available in bottles or sealed in aluminum or glass cells.

Wavelength Shifters
Available in sheet material or as paint for making thin films.

Scintillation and Wavelength Shifting Fibers
Available in single and double clad, round or square, canes, spools, and bundles, with diameters ranging from 0.3 mm to 5.0 mm.

 

Light Guides and Acrylic Plastic
Used for uniform light collection from a scintillator.

Neutron Detectors
Specially designed scintillators for fast neutron or thermal neutron detection.

Zinc Sulfide Coated
ZnS:Ag coated plastic sheets or plastic scintillator sheets designed for alpha or alpha/beta detection.

Accessories
Products for detector assembly and photosensor coupling.

WAVELENGTH SHIFTING PLASTICS

EJ-280, EJ-282, EJ-284, EJ-286

Four wavelength shifting (WLS) plastics are available. All are normally based on PVT but can also be provided based on PVT variants providing higher temperature characteristics. These products are also available in custom formulations. Please contact us regarding your specific requirements.

EJ-280 is a green-emitting WLS plastic ideal for shifting the emission spectra of common blue scintillators. It is commonly used in the form of long narrow bars air-coupled to blue scintillators arrayed either in flat planes or in stacks. The bars provide a compact means of light collection. The green light is effectively turned 90° as a result of the isotropic re-emission and is transmitted by total internal reflection to photomultiplier tubes at both ends of the bar to achieve highly uniform light collection. While there is a typical 75% loss of signal amplitude in these systems, they can provide advantages over conventional light collection methods.  Although not indicated in the spectrum below, EJ-280 has also been shown to be particularly good for shifitng wavelengths below 200 nm.

EJ-282 is a green-emitting WLS plastic similar to EJ-280 but with a slightly shorter maximum emission wavelength making it suitable for use with blue-sensitive photomultiplier tubes.

EJ-284 is a red-emitting WLS plastic ideal for shifting green-emitting scintillators such as CsI(Tl) into the red. There is also a useful absorption maximum in the blue, as indicated in the spectrum below.

EJ-286 is a blue-emitting WLS plastic with strong broad absorbance in the near-UV and formerly known as EJ-299-27. It is formulated to reduce the scintillation response by a factor exceeding 100x.