Introduction of a Nist Instrument Sensitivity Standard Reference Material for X-Ray Powder Diffraction

1991 ◽  
Vol 35 (A) ◽  
pp. 341-352 ◽  
Author(s):  
James P. Cline ◽  
Susannah B. Schiller ◽  
Ron Jenkins
Keyword(s):  
Reference Material ◽  
Powder Diffraction ◽  
Standard Reference Material ◽  
Systematic Bias ◽  
Diffraction Intensity ◽  
Preparation Methods ◽  
X Ray ◽  
Test Instrument ◽  
Sensitivity Standard ◽  
Instrument Sensitivity

AbstractImprovements in sample preparation methods have resulted in increased accuracy in x-ray powder diffraction intensity measurements. This improvement has focused scrutiny on the instrument as a potential source of error. NIST Standard Reference Material, SRM, 1976 consists of a sintered α alumina, corundum, plate certified with respect to 12 relative intensity values from 25 to 145 degrees 2θ. Its function is to allow for standardization of powder diffraction intensity as a function of 2θ angle (instrument sensitivity). An increase in the accuracy of interlaboratory comparisons of diffraction intensity and related determinations will result. Utilization of the SRM requires the user to collect intensity data from the test instrument in a manner which conforms to that used in the certification. Graphical interpretation of the ratio of these data to those on the certificate will allow for appropriate judgment as to the condition of the test instrument. Discontinuities in the data indicate a malfunctioning or misaligned instrument. Systematic bias, introduced by design characteristics of the test instrument, manifests itself in terms of a pattern in the data other than a horizontal straight line with value of one. This bias may be removed with the calculation and application of a correction curve.

Request For Comments A Reference Standard for Determining Instrumental Response for X-Ray Powder Diffraction

1990 ◽  
Vol 5 (4) ◽  
pp. 204-205
Author(s):  
W.N. Schreiner ◽  
Ron Jenkins
Keyword(s):  
Reference Material ◽  
Response Function ◽  
Powder Diffraction ◽  
Standard Reference Material ◽  
Instrumental Response ◽  
Reference Standard ◽  
X Ray ◽  
Powder Diffractometer ◽  
Intensity Response

This note discusses the use of the powder-diffractometer intensity-response function reference standard to be released shortly by the National Institute of Standards and Technology (NIST) as a Standard Reference Material (SRM). Its purpose is to encourage use of the standard and to stimulate discussion and comments from readers with regard to the procedure for its use. Comments may be addressed to either of the authors.

X-ray photoelectron spectroscopy studies of laterite standard reference material

2005 ◽  
Vol 228 (1-2) ◽  
pp. 151-162 ◽  
Author(s):  
J. Mendialdua ◽  
R. Casanova ◽  
F. Rueda ◽  
A. Rodríguez ◽  
J. Quiñones ◽  
...  
Keyword(s):  
Reference Material ◽  
Standard Reference Material ◽  
Photoelectron Spectroscopy ◽  
X Ray ◽  
Spectroscopy Studies

scholarly journals NIST Standard Reference Material 3600: Absolute Intensity Calibration Standard for Small-Angle X-ray Scattering

2017 ◽  
Vol 50 (2) ◽  
pp. 462-474 ◽  
Author(s):  
Andrew J. Allen ◽  
Fan Zhang ◽  
R. Joseph Kline ◽  
William F. Guthrie ◽  
Jan Ilavsky
Keyword(s):  
Reference Material ◽  
Small Angle ◽  
Standard Reference Material ◽  
Absolute Intensity ◽  
Calibration Standard ◽  
X Ray ◽  
X Ray Scattering ◽  
Nist Standard Reference Material ◽  
Intensity Calibration ◽  
Ray Scattering

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.

D-57 NIST SRM 2000—A High Resolution X-ray Diffraction Standard Reference Material

2009 ◽  
Vol 24 (2) ◽  
pp. 171-171 ◽  
Author(s):  
D. Windover ◽  
D.L. Gil ◽  
A. Henins ◽  
J.P. Cline
Keyword(s):  
High Resolution ◽  
Reference Material ◽  
Standard Reference Material ◽  
X Ray Diffraction ◽  
X Ray

A silicon powder diffraction standard reference material

1975 ◽  
Vol 8 (1) ◽  
pp. 45-48 ◽  
Author(s):  
C. R. Hubbard ◽  
H. E. Swanson ◽  
F. A. Mauer
Keyword(s):  
Reference Material ◽  
Powder Diffraction ◽  
Standard Reference Material ◽  
Silicon Powder

Deconvolution–convolution treatment on powder diffraction data collected with CuKα X-ray and NiKβ filter

2018 ◽  
Vol 33 (2) ◽  
pp. 80-87 ◽  
Author(s):  
Takashi Ida ◽  
Shoki Ono ◽  
Daiki Hattan ◽  
Takehiro Yoshida ◽  
Yoshinobu Takatsu ◽  
...  
Keyword(s):  
Powder Diffraction ◽  
Diffraction Data ◽  
Background Intensity ◽  
Intensity Data ◽  
Powder Diffraction Data ◽  
Diffraction Intensity ◽  
Powder Specimen ◽  
One Dimensional ◽  
X Ray ◽  
Strip Detector

A method to remove small CuKβ peaks and step structures caused by NiK-edge absorption as well as CuKα2 sub-peaks from powder diffraction intensity data measured with Cu-target X-ray source and Ni-foil filter is proposed. The method is based on deconvolution–convolution treatment applying scale transform of abscissa, Fourier transform, and a realistic spectroscopic model for the source X-ray. The validity of the method has been tested by analysis of the powder diffraction data of a standard LaB6 powder (NIST SRM660a) sample, collected with the combination of CuKα X-ray source, Ni-foil Kβ filter, flat powder specimen and one-dimensional Si strip detector. The diffraction intensity data treated with the method have certainly shown background intensity profile without CuKβ peaks and NiK-edge step structures.

scholarly journals NIST High Resolution X-Ray Diffraction Standard Reference Material: SRM 2000

2009 ◽  
Author(s):  
Donald Windover ◽  
David L. Gil ◽  
Albert Henins ◽  
James P. Cline ◽  
Erik M. Secula ◽  
...  
Keyword(s):  
High Resolution ◽  
Reference Material ◽  
Standard Reference Material ◽  
X Ray Diffraction ◽  
X Ray

scholarly journals Variation in the Measurement of Anti-Müllerian Hormone – What Are the Laboratory Issues?

2021 ◽  
Vol 12 ◽  
Author(s):  
Rivak Punchoo ◽  
Sachin Bhoora
Keyword(s):  
Reference Material ◽  
Standard Reference Material ◽  
Developmental Disorders ◽  
Method Development ◽  
Ovarian Response ◽  
Enzyme Linked Immunosorbent Assay ◽  
Systematic Bias ◽  
Dose Selection ◽  
The Impact

Anti-Müllerian Hormone (AMH) is a 140 kDa homodimeric glycoprotein consisting of two identical subunits linked by disulphide bonds and is synthesised by the testes and ovaries. Its clinical applications are prediction of ovarian response and gonadotropin dose selection upon in vitro fertilization. In males, AMH is used to investigate sexual developmental disorders and gonadal function. AMH is commonly assayed by enzyme-linked immunosorbent assay or automated immunoassay formats that show variation between methods. This review applies fundamental chemical pathology concepts to explain the observed analytical variation of AMH measurement. We examine the lack of standardisation between AMH assays, the impact of antibody design on variable measurements, consider the analytical detection of AMH isoforms, review analytical interference in AMH measurement, and briefly assess systematic bias between AMH assays. The improved attempt at standardising AMH measurement by the recent approval of a WHO Reference Reagent offers promise for harmonising immunoassay results and establishing consensus medical cut-off points for AMH in disease. Standardisation, however, will need to redress the issue of poor commutability of standard reference material and further assign a standard reference procedure to quantify AMH standard reference material. The improvement of the analytical phase of AMH testing will support harmonised method development and patient care.

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