| 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 |
Checkout
Status |
| 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 |
