A statistical approach to correct x-ray response non-uniformity in microstrip detectors for high-accuracy and high-resolution total-scattering measurements

Kenichi Kato, Yoshihito Tanaka, Miho Yamauchi, Koji Ohara, Takaki Hatsui

    Research output: Contribution to journalArticlepeer-review

    14 Citations (Scopus)

    Abstract

    An unbiased approach to correct X-ray response non-uniformity in microstrip detectors has been developed based on the statistical estimation that the scattering intensity at a fixed angle from an object is expected to be constant within the Poisson noise. Raw scattering data of SiO2 glass measured by a microstrip detector module was found to show an accuracy of 12σPN at an intensity of 106 photons, where σPN is the standard deviation according to the Poisson noise. The conventional flat-field calibration has failed in correcting the data, whereas the alternative approach used in this article successfully improved the accuracy from 12σPN to 2σPN. This approach was applied to total-scattering data measured by a gapless 15-modular detector system. The quality of the data is evaluated in terms of the Bragg reflections of Si powder, the diffuse scattering of SiO2 glass, and the atomic pair distribution function of TiO2 nanoparticles and Ni powder.

    Original languageEnglish
    Pages (from-to)762-773
    Number of pages12
    JournalJournal of Synchrotron Radiation
    Volume26
    Issue number3
    DOIs
    Publication statusPublished - May 2019

    All Science Journal Classification (ASJC) codes

    • Radiation
    • Nuclear and High Energy Physics
    • Instrumentation

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