Fogging in Polyvinyl Toluene Scintillators

Journal Article · Sun Feb 01 00:00:00 EST 2015 · IEEE Transactions on Nuclear Science, 62(1):368-371

DOI:https://doi.org/10.1109/TNS.2015.2390076· OSTI ID:1184899

Cameron, Richard J.; Fritz, Brad G.; Hurlbut, Charles; Kouzes, Richard T.; Ramey, Ashley; Smola, Richard

It has been observed that large polyvinyl toluene (PVT)-based gamma ray detectors can suffer internal “fogging” when exposed to outdoor environmental conditions over long periods of time. When observed, this change results in reduced light collection by photomultiplier tubes connected to the PVT. Investigation of the physical cause of these changes has been explored, and a root cause identified. Water penetration into the PVT from hot, high-humidity conditions results in reversible internal water condensation at room temperature, and permanent micro-fracturing of the PVT at very low environmental temperatures. Mitigation procedures and methods are being investigated.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1184899
• Report Number(s): PNNL-SA-105192; 400904120
• Journal Information: IEEE Transactions on Nuclear Science, 62(1):368-371, Journal Name: IEEE Transactions on Nuclear Science, 62(1):368-371
• Country of Publication: United States
• Language: English

Related Subjects

plastic scintillator
polyvinyl toluene
PVT
aging effects
crazing
fogging
linear expansion coefficient