Abstract
The paper describes a scintillation counter apparatus used for single-crystal X-ray diffractometry. The variation of the signal/noise ratio with photomultiplier operating potential has been investigated for the Du Mont 6291 tube, and it is shown that the resolution of the signal pulses from the noise background improves as this potential is decreased. Signal resolutions of 26, 29 and 43% have been obtained with AgKα, MoKα and CuKα radiations respectively, the mean number of photoelectrons released per keV incident quantum energy being 6. Stability criteria which will help to ensure the overall uniformity in the counter response are suggested.
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