X-Ray attenuation coefficients at different energies and the validity of the mixture rule for compounds around the absorption edge

TURGUT Ü., ŞİMŞEK Ö., Buyukkasap E., ERTUĞRUL M.

SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY, cilt.57, sa.2, ss.261-266, 2002 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 57 Sayı: 2
  • Basım Tarihi: 2002
  • Doi Numarası: 10.1016/s0584-8547(01)00373-1
  • Dergi Adı: SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.261-266
  • Anahtar Kelimeler: XAFS, mixture rule, mass attenuation coefficients, chemical effect, 3d elements, PHOTOELECTRIC CROSS-SECTIONS, MASS ATTENUATION, PHOTON ENERGIES, RANGE, ELEMENTS
  • Atatürk Üniversitesi Adresli: Evet

Özet

The total mass attenuation coefficients for the elements Co, Mn and CO2O3, compounds CoCl2.6H(2)O, COSO4, COSO4.7H(2)O, MnCO3, KMnO4, MnCl2.2H(2)O, and MnCl2.4H(2)O were measured at different energies between 4.508 and 11.210 keV using a secondary excitation method. Ti, Co, Ni, Cu, Zn, As, Se were chosen as secondary exciter. Gamma rays (59.5 keV) emitted from an Am-241 annular source were used to excite a secondary exciter and K-alpha (K-L-3, L-2) lines emitted of a secondary exciter were counted by a Si(Li) detector with a resolution of 160 eV at 5.9 keV. It was observed that the mixture rule method is not suitable for determination of the mass attenuation coefficients of compounds, especially at energy that is near the absorption edge. Obtained values were compared with theoretical values. (C) 2002 Elsevier Science B.V. All rights reserved.