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 journalArticle

5 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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