Record Display for the EPA National Library Catalog

RECORD NUMBER: 1421 OF 1424

OLS Field Name OLS Field Data
Main Title X-Ray Emission Analysis: Sample Losses During Excitation.
Author Shaw, Jr., R. W. ; Willis, R. D. ;
CORP Author Environmental Sciences Research Lab., Research Triangle Park, NC.
Year Published 1978
Report Number EPA-600/J-78-169;
Stock Number PB80-184286
Additional Subjects X ray analysis ; Gas analysis ; Samples ; Excitation ; Air pollution ; Chemical analysis ; Aerosols ; Heat ; Energy dissipation ; Ammonium sulfate ; Aluminum ; Copper ; Gold ; Lead inorganic compounds ; Reprints ; Biomaterials ; Air pollution detection ; Lead bromides ; Lead chlorides
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB80-184286 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 10p
Abstract
Many samples of atmospheric aerosols and biological materials containing volatile or unstable species are now being examined by X-ray emission analysis, and loss of these species by sample heating is a critical consideration. The amount of heat energy deposited in a sample by the various modes of excitation may vary by orders of magnitude. For example, if one were looking for sulfur in 1-micrometer particles of (NH4)2SO4, and using projectiles at typical operating energies (10-keV electrons or 3-MeV protons) as a means of excitation, about 1000 keV of energy would be deposited per sulfur K-shell ionization produced; while photons of energy 8-keV (using Cu K(alpha)) would deposit only about 5-keV for each K shell ionization. This paper presents calculations of energy dissipation and sample heating and loss of Al, Cu, Au, PbBrCl and (NH4)2SO4 under typical operating conditions.