Author: Kurt F. J. HeinrichPublisher:
ISBN:
Category : Spectrum analysis
Languages : en
Pages : 132
Book Description
Activities of the NBS Spectrochemical Analysis Section, July 1970 to June 1971
Author: Kurt F. J. HeinrichPublisher:
ISBN:
Category : Spectrum analysis
Languages : en
Pages : 132
Book Description
Monthly Catalog of United States Government Publications
Author: Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1932
Book Description
NBS Technical Note
Author: Publisher:
ISBN:
Category : Physical instruments
Languages : en
Pages : 130
Book Description
Activities of the NBS Spectrochemical Analysis Section, July 1969 to June 1970
Author: Bourdon Francis ScribnerPublisher:
ISBN:
Category : Spectrum analysis
Languages : en
Pages : 120
Book Description
Spectrochemical research activities, improvements in equipment, and applications, especially to the certification of NBS Standard Reference Materials, are summarized. In electron probe microanalysis, a comprehensive computer correction program for accurate analysis of materials relative to single elements or simple compounds was developed, an improved lithium-doped silicon detector was found to provide increased resolution, and improvements in microprobe instrumentation produced a high level of stability. Studies of procedures for correction of x-ray fluorescence measurements were made, instrumental changes resulted in marked improvement in performance reliability, and new applications were made. In optical emission spectrometry, studies were made of beryllium determination in an air pollution investigation and trace analyses were made of organic materials to parts per billion limits. Methods of pre-concentration of impurities are described for optical emission and isotope dilution spark source mass spectrometric analysis of ingot iron, botanical materials, and high purity reagents. Work on Standard Reference Materials resulted in certification of stainless steel, clays, ferrosilicon, blast furnace irons, white irons, lead bearing metal, and ductile irons. (Author).
Business Service Check List
Author: Journal of Research of the National Bureau of Standards
Author: Technical News Bulletin
Author: Technical News Bulletin of the National Bureau of Standards
Author: Technical News Bulletin of the Bureau of Standards
Author: United States. National Bureau of StandardsPublisher:
ISBN:
Category : Technology
Languages : en
Pages : 316
Book Description
Principles and Practice of X-Ray Spectrometric Analysis
Author: E.P. BertinPublisher: Springer Science & Business Media
ISBN: 1461344166
Category : Science
Languages : en
Pages : 1098
Book Description
Since the first edition of this book was published early in 1970, three major developments have occurred in the field of x-ray spectrochemical analysis. First, wavelength-dispersive spectrometry, in 1970 already securely established among instrumental analytical methods, has matured. Highly sophisticated, miniaturized, modular, solid-state circuitry has replaced elec tron-tube circuitry in the readout system. Computers are now widely used to program and control fully automated spectrometers and to store, process, and compute analytical concentrations directly and immediately from ac cumulated count data. Matrix effects have largely yielded to mathematical treatment. The problems associated with the ultralong-wavelength region have been largely surmounted. Indirect (association) methods have extended the applicability of x-ray spectrometry to the entire periodic table and even to certain classes of compounds. Modern commercial, computerized, auto matic, simultaneous x-ray spectrometers can index up to 60 specimens in turn into the measurement position and for each collect count data for up to 30 elements and read out the analytical results in 1--4 min-all corrected for absorption-enhancement and particle-size or surface-texture effects and wholly unattended. Sample preparation has long been the time-limiting step in x-ray spectrochemical analysis. Second, energy-dispersive spectrometry, in 1970 only beginning to assume its place among instrumental analytical methods, has undergone phenomenal development and application and, some believe, may supplant wavelength spectrometry for most applications in the foreseeable future.