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Preparation of P‐47 scintillators for STEM
Author(s) -
Baumann W.,
Niemietz A.,
Reimer L.,
Volbert B.
Publication year - 1981
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.1981.tb01257.x
Subject(s) - scintillator , electron , optics , materials science , coating , scintillation , absorption (acoustics) , aluminium , photomultiplier , scattering , light scattering , range (aeronautics) , physics , nuclear physics , composite material , detector
SUMMARY Uniform P‐47 powder scintillators can be prepared with reproducible mass thicknesses by sedimenting the powder in an 0·01% solution of formvar in chloroform. A reflecting coating can be glued by floating a 60 nm aluminium film on the scintillation layer in an 0·1% solution of gelatine in water. The optimum thickness of P‐47 for 20–100 keV electrons increases slower than the electron range due to the absorption and scattering of light with increasing thickness. An aluminium coating increases the light output by a factor 1·85 for 20 keV and 1·4 for 100 keV electrons. The noise of the emitted light quanta and the photomultiplier detection system shows a minimum for the optimum thickness of largest light output and is only a factor 1·3–1·6 larger than the calculated shot noise of the incident electron beam.