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 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 changes in the
sensitivity of the IP detector as a function of age.
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