An imporved method for intensity uniformity calibration of diffraction
data collected on spiral readout image plate (IP) systems is described.
The procedure utilizes an attenuated direct beam scan of the IP to
generate a radial sensitivity calibration table. Exposure and scanning
of the calibration frame is done on the same time scale as typical data
collections and requires no additional equipment. Specific examples are
presented for use with Mac Science DIP-2000 systems. The new radial
calibration is shown to significantly reduce structure based R-factors.
The improved radial calibration is also shown to lower R merge when the
IP is offset from beam center. In addition to improving data quality
and statistics this method provides a quick and simple diagnostic tool to
monitor changers in the sensitivity of the IP detector as a function of
age.
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