skip to main content

SciTech ConnectSciTech Connect

Title: Fogging in Polyvinyl Toluene Scintillators

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.
Authors:
; ; ; ; ;
Publication Date:
OSTI Identifier:
1184899
Report Number(s):
PNNL-SA-105192
400904120
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: IEEE Transactions on Nuclear Science, 62(1):368-371
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
plastic scintillator; polyvinyl toluene; PVT; aging effects; crazing; fogging; linear expansion coefficient