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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
Library Call Number Additional Info Location Last
NTIS  PB80-184286 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
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.
Supplementary Notes Pub. in Electron Microscopy and X-Ray Applications, p51-64 1978. Prepared in cooperation with Duke Univ., Durham, NC. Dept. of Physics.
Title Annotations Reprint: X-Ray Emission Analysis: Sample Losses During Excitation,
PUB Date Free Form 1978
Category Codes 7D; 68A; 99A
NTIS Prices PC A02/MF A01
Primary Description 600/09
Document Type NT
Cataloging Source NTIS/MT
Control Number 323779504
Origin NTIS
Type CAT