title: NIST Standard Reference Material 3600: Absolute Intensity Calibration Standard for Small-Angle X-ray Scattering.
abstract: The certification of a new standard reference material for small-angle scattering [NIST Standard Reference Material (SRM) 3600: Absolute Intensity Calibration Standard for Small-Angle X-ray Scattering (SAXS)], based on glassy carbon, is presented. Creation of this SRM relies on the intrinsic primary calibration capabilities of the ultra-small-angle X-ray scattering technique. This article describes how the intensity calibration has been achieved and validated in the certifiedQrange,Q= 0.008-0.25 Å-1, together with the purpose, use and availability of the SRM. The intensity calibration afforded by this robust and stable SRM should be applicable universally to all SAXS instruments that employ a transmission measurement geometry, working with a wide range of X-ray energies or wavelengths. The validation of the SRM SAXS intensity calibration using small-angle neutron scattering (SANS) is discussed, together with the prospects for including SANS in a future renewal certification.
authors.affiliation: Materials Measurement Science Division, National Institute of Standards and Technology , 100 Bureau Drive, Gaithersburg, MD 20899, USA.
authors.forename: Andrew J
authors.identifier: https://orcid.org/0000-0002-6496-8411
authors.initials: AJ
authors.lastname: Allen
authors.affiliation: Materials Measurement Science Division, National Institute of Standards and Technology , 100 Bureau Drive, Gaithersburg, MD 20899, USA.
authors.forename: Fan
authors.initials: F
authors.lastname: Zhang
authors.affiliation: Materials Science and Engineering Division, National Institute of Standards and Technology , 100 Bureau Drive, Gaithersburg, MD 20899, USA.
authors.forename: R Joseph
authors.initials: RJ
authors.lastname: Kline
authors.affiliation: Statistical Engineering Division, National Institute of Standards and Technology , 100 Bureau Drive, Gaithersburg, MD 20899, USA.
authors.forename: William F
authors.initials: WF
authors.lastname: Guthrie
authors.affiliation: X-ray Science Division, Advanced Photon Source, Argonne National Laboratory , 9700 South Cass Avenue, Argonne, IL 60439, USA.
authors.forename: Jan
authors.initials: J
authors.lastname: Ilavsky
keywords: absolute scattering intensity calibration; glassy carbon; small-angle X-ray scattering; standard reference materials