Measurement of L X-ray cross-sections and relative intensities of heavy elements by 15.2 keV photons

✍ Scribed by W. Salah; J. Al-Jundi

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 222 KB
• Volume: 94
• Category: Article
• ISSN: 0022-4073
• DOI: 10.1016/j.jqsrt.2004.09.017

✦ Synopsis

Total L X-ray fluorescence cross-sections have been measured for the elements La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Tm, Yb and Lu using a photon energy of 15.2 keV. The measurements have been performed using an annular source of 241 Am. The obtained cross-sections were then compared with the theoretical values evaluated using semi-empirically fitted values of L-subshell fluorescence yields and Coster-Kronig transition probabilities based on relativistic Dirac-Hartree-Slater theory. Good agreement was observed between the experimental and theoretical values. Relative intensities I L b =I L a and I L g =I L a have been also measured for the same elements. The accuracy of the measurements varies up to 6% (except for the L g Xray line around 8%).