Thin scintillators and position sensitive photomultiplier tubes for hard X-ray imaging in space

摘要

Monolithic CsI(TI) scintillators coupled to a position sensitive photomultiplier tube (PSPMT) have been tested for imaging and environmental performance necessary for hard X-ray astrophysics missions. Using a crossed-wire PSPMT and individual anode-wire readout, a spatial resolution of 1-2 mm rms at 60 keV over the entire photo-cathode imaging surface is obtained out to near the edges of the scintillator. A PSPMT mapping correction was used to obtain an energy resolution close to what is expected from CsI(TI) scintillators. We have also tested pixellated scintillators and find an equivalent spatial resolution but with an energy resolution which is unacceptable for our applications.