High Light Output, High Yield Plastic Scintillator Fibers

Plastic scintillators are relatively easy to manufacture and cheaper compared to their inorganic counterparts. The main drawbacks of plastic scintillators are low light output and low resolution which limits their applications. To develop a new, higher performance family of plastic scintillators and fibers, it is essential to use advances in polymer science and a fundamental understanding of molecular interactions, such as energy transfer and light harvesting. Tetramer proposes the development of a modified, commercial scintillating polymer host material which has a tunable glass transition temperature (Tg) and desirable energetics compared to commercial PVT and PS host polymers. The overall objective of this proposal is to develop, synthesize, and manufacture gamma-sensitive, scintillating plastic fibers utilizing the modified polymer matrix to achieve an easy-to-process host with higher light output than current commercial materials. This project leverages the capabilities of the both Tetramer and Clemson University to achieve a commercially viable product. Tetramer has deep understanding and experience in molecular architecture and has commercialized specialty optical polymers. Tetramer will work closely with Clemson University to characterize these materials and evaluate their compatibility with extrusion molding or fiber drawing manufacturing processes. In During Phase I, Tetramer will develop (1) a moderate-to-high molecular weight polymer matrix suitable for processing, (2) prepare organometallic-doped polymer matrix bulk samples and (3) measure gamma ray detection properties as well as the thermomechanical properties for the new plastic scintillators. The final step of the Phase I will be to produce a prototype plastic scintillating fiber. Phase I possesses a low risk approach due to Tetramer’s well-established understanding of molecular architecture and breadth of manufacturing and testing capabilities. Once the scintillating fiber materials are realized and validated, the Phase II program will focus on the development of manufacturing processes for these materials. Special fiber designs (waveguides) can be incorporated in Phase II to provide long attenuation lengths that will enable 3D radiation mapping applications using distributed sensing. Advanced 3D radiation mapping has potential application in medical diagnostics and in homeland security for safeguards. Additionally, high-Z materials will be incorporated into the polymer matrix to enhance their utility for gamma spectroscopy applications.