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Fast Scintillators for High Energy Physics and PET Applications
Date: Monday, February 4, 2013 Time: 4:00pm Location: 125 Steele, Caltech Speaker: David Hitlin
KNI / MDL Seminar
Scintillating crystals often provide optimal detectors for high-energy photons in elementary particle physics experiments or PET scanning devices for medical applications. Modern applications in both areas require advances in the rate capability and time resolution of these scintillators. Barium fluoride is a well-known crystal scintillator that has a very fast light component (< 1ns) at 220 nm that comprises 15% of the light output, with 85% of the light in a slow component (650 ns) at 330 nm. The potential new applications motivate an effort to detect the fast component while suppressing sensitivity to the slow component. This can be done by a combination of crystal dopants that quench the slow component, and development of a novel avalanche photodiode with high quantum efficiency at 220 nm and greatly reduced QE at 330 nm, using techniques developed at the JPL Microelectronics Lab.
Light refreshments will be served after the seminar.