Numerous light guides have been fabricated by Eljen Technology to meet a wide variety of light collection applications for scintillators. Light guides are always custom made for each customer's needs. One general rule to remember when considering using light guides: they usually improve the uniformity of light collection but often reduce the average signal amplitude. Light guide types fabricated by Eljen include, but are not limited to, the following general types:

Adiabatic Light Guides:

Consists of an array of strips adapting the edges of scintillator plates to a single phototube. These generally apply best on wide scintillators and are the most expensive.

Fishtail Light Guides: 

Consists of a single solid element providing a smooth adaption of a rectangular cross section to a round PMT face.

Flat Trapezoid Light Guides: 

Consists of a flat triangular PMMA sheet terminated at the PMT end by a cylindrical rod or disc for effective PMT mounting.

Light guides are fabricated from cast acrylic materials. Cast acrylic generally has good optical clarity, good mechanical properties, and very little natural scintillation response to ionizing radiation.