Thin film NaI(Tl) scintillators for high-resolution large-area imaging of soft x-rays
- Univ. of Virginia, Charlottesville, VA (United States)
The authors are developing NaI(Tl) phosphors to use on large-area, photon-counting imaging photomultiplier tubes. An x-ray absorption uniformity of 99% is expected over an area of 133 cm{sup 2} at a film thickness of 38 {+-} 1.5 {micro}m. The spatial resolution f the scintillator films, up to 61 {micro}m thick, is consistent with a total detector resolution of less than 92 {micro}m, given a phototube resolution of 65 {micro}m fwhm. The fwhm for 8 keV spots is presented as a function of angle up to 40 degrees off-incidence and a simple model for the broadening of the fwhm due to parallax is presented. Improvements of 20% in the light-collection efficiency were observed for fiber optic disks coated with potassium silicate before vapor-depositing the NaI(Tl). The authors present absolute scintillating energy efficiency measurements by comparing the films to the scintillation of single crystal NaI(Tl).
- OSTI ID:
- 215623
- Report Number(s):
- CONF-930722--; ISBN 0-8194-1258-9
- Country of Publication:
- United States
- Language:
- English
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