The optical properties of the ‘‘bialkali’’ KCsSb and RbCsSb photomultiplier cathodes have been experimentally investigated in the visible range. The measurements carried out include the absolute reflectance at near-normal incidence, the polarization-dependent relative reflectance at various angles and the change in polarization upon reflection from the photocathode. These experimental inputs ha...

The Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE) is designed to explore the gamma-ray sky between 20 and 250 GeV using the atmospheric Cherenkov technique. STACEE will use large solar heliostat mirrors to reflect Cherenkov light created in gamma-ray air showers to secondary mirrors on a central tower. The secondary mirrors image this light onto photomultiplier tube cameras that ...

Although photomultiplier tubes still dominate in scintillation detectors, silicon photodiodes are becoming increasingly popular. Scintillation light: λ = 200 – 500 nm (E= 6.2 – 2.5 eV) Semiconductor photodiodes offer a) high quantum efficiency (70-90% instead of 30% for PMTs) b) insensitivity to magnetic fields c) small size Introduction to Radiation Detctors and Electronics, 22-Apr-99 Helmuth ...

Magnetic iron oxide nanoparticle clusters (mnpc) coated with organic stabilizers were investigated using scanning transmission x-ray microscopy (STXM). Simultaneous surface and bulk sensitive Fe L3 edge absorption spectra, obtained using a photomultiplier tube and a channeltron, were used to detect subtle changes in the oxidation state in the surface and bulk of Iron Oxide mnpc. The effectivene...