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Displaying 1276 - 1300 of 1931

Measures for Spectral Quality in Low-Voltage X-Ray Microanalysis

November 1, 2000
Author(s)
Dale E. Newbury
Characteristic x-ray production with energetic electrons depends strongly on the overvoltage, the ratio of the incident beam energy to the critical excitation energy for the atomic species of interest. Low voltage x-ray microanalysis (beam energy < 5 keV)

Shape Factors of ISO 12103-A3 (Medium Test Dust)

November 1, 2000
Author(s)
Robert A. Fletcher, David S. Bright
A new derivative of Arizona sand, ISO Medium Test Dust, is coming into use as a liquid optical particle count calibrant. ISO Medium Test Dust and optical particle counters are used to test filtering efficiency. Particle shape plays a role in both filtering

Amphibole Asbestos From Libby, Montana: Aspects of Nomenclature

October 1, 2000
Author(s)
A G. Wylie, Jennifer R. Verkouteren
Richterite-asbestos and winchite-asbestos are not listed in the Federal regulations governing asbestos. However, asbestiform winchite is found in the gangue at the Libby, Montana, vermiculite deposit, where asbestos-related diseases have been reported

Low-Level (Submicromole) Environmental 14 C Metrology

October 1, 2000
Author(s)
Lloyd A. Currie, J D. Kessler, J V. Marolf, A. P. McNichol, D R. Stuart, J C. Donoghue, D. J. Donahue, William Burr, D Biddulph
Accelerator Mass Spectrometry (AMS) measurements of environmental 14C have been employed during the past decade at the several micromole level (10's of ug carbon), but advanced research in the atmospheric and marine sciences demands still higher
Displaying 1276 - 1300 of 1931
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