Search results for "High radiation"
showing 4 items of 4 documents
-ray-induced intrinsic defect processes in fluorine-doped synthetic SiO2 glasses of different fluorine concentrations
2009
Fluorine-doped synthetic SiO2 glass is suitable for investigating intrinsic defect processes in SiO2 glass because of the high radiation hardness and the low concentrations of defect precursors such as the strained Si O Si bonds and impurity-related network modifiers including SiOH, SiH, and SiCl groups. When the concentrations of the defect precursors are minimized by moderate fluorine doping into SiO2 glass, formation of oxygen vacancy–interstitial pairs (Frenkel pairs) is the primarily Co60γ-ray-induced defect process. However, heavy fluorine doping tends to degrade the radiation hardness and enhance the formation of the silicon and oxygen dangling bonds, suggesting the presence of anoth…
Overview of HVCMOS pixel sensors
2015
High voltage CMOS (HVCMOS) sensors are presently considered for the use in Mu3e experiment, ATLAS and CLIC. These sensors can be implemented in commercial HVCMOS processes. HVCMOS sensors feature fast charge collection by drift and high radiation tolerance. The sensor element is an n-well/p-type diode. This proceeding-paper gives an overview of HVCMOS projects and the recent results.
Radiosynthesis of 3-indolyl[1-11C]acetic acid for phyto-PET-imaging: An improved production procedure and formulation method
2014
Abstract An improved production procedure and formulation method for the carbon-11 radiolabeled phytohormone, 3-indolyl-[l- 11 C]acetic acid ([ 11 C]IAA), was developed by modifying selected original reaction parameters. This updated procedure both doubled the yield (from 25.9±6.7% ( n =12) to 61.0±0.3% ( n =10)) and increased the concentration (0.2–0.4 GBq/0.15–0.3 mL), enabling us to provide the radiotracer [ 11 C]IAA suitable for in vivo phyto-PET-imaging studies. The specific activity was improved by more than a factor of three (26.7±5.6 GBq/µmol to 82.5±36.1 GBq/µmol). The total synthesis time for both production and formulation was 81.8±3.0 min ( n =10). In addition, a streamlined sem…
Highlights and essentials from the first "experts-live" course of the EuroCTO club
2010
Chronic total occlusions (CTOs) are frequently encountered during diagnostic coronary catheterisation. However, there is still confusion regarding the indication for percutaneous coronary intervention (PCI) in this lesion subset, mainly because it is cumbersome and the prognostic impact of revascularisation in these patients remains unclear. Many studies have now shown the long term clinical benefits after CTO PCI1-3; still, with procedural complexity, high radiation exposure to both the patient and the operator, high costs and lower procedural success rates, most patients with CTO are managed medically or referred for bypass graft surgery – regardless of the severity of symptoms and extent…