Journal article
Measuring the linearity of X-ray detectors: Consequences for absolute attenuation, scattering and absolute Bragg intensities
Z Barnea, CT Chantler, JL Glover, MW Grigg, MT Islam, MD De Jonge, NA Rae, CQ Tran
Journal of Applied Crystallography | WILEY-BLACKWELL | Published : 2011
Abstract
The linearity of response of X-ray detectors is tested. Examples of linearity tests demonstrate the remarkable range of linear response of flowing-gas ion chambers in the synchrotron environment. The diagnostic is also highly sensitive to the presence in the X-ray beam of harmonic X-rays diffracted by a higher-order reflection of the monochromator. The remarkable range of linearity of ion chambers has enabled the accurate measurement of the absolute X-ray attenuation of a number of elements. It should now be possible to measure the absolute intensity of Bragg reflections, provided such measurements are carried out with extended-face single crystals. The advantages of the extended-face crysta..
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Awarded by US Department of Energy, Basic Energy Sciences, Office of Energy Research
Funding Acknowledgements
We are grateful to Andrew W. Stevenson and Tim Davis for advice and the use of the CSIRO imaging plate and readout system. ZB is grateful to the Australia Research Council for grants supporting the work with extended-face crystals. This work was supported by the Australian Synchrotron Research Program, which is funded by the Commonwealth of Australia under the Major National Research Facilities Program and by a number of grants of the Australia Research Council. Use of the Advanced Photon Source was supported by the US Department of Energy, Basic Energy Sciences, Office of Energy Research, under contract No. W-31-109-Eng-38. We are grateful for the assistance of the synchrotron staff at the Australian National Beamline Facility, at beamline 20B of the Photon Factory in Tsukuba, Japan.