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The Efficiency of the Recessed Source; Geometry for EDXRF Analysis of Metal Impurities in Oils

  • J.M.F. dos Santos (a1), C. A. N. Conde (a1), L. F. Requicha Ferreira and A. J. De Campos (a1)

Abstract

The efficiency of the recessed source geometry for the analysis of the content of wear metals in engine lubricant oils by Energy Dispersive X-Ray Fluorescence (EDXRF) methods is calculated by a Monte Carlo simulation considering X-ray detectors of the Gas Proportional Scintillation Counter type and excitation by Cd-109, Cm-244 and Fe-55 radioactive sources. Calculated spectra for the case of a typical aircraft oil with Cu, Fe, Cr, Ti, Sn and Ag impurities in the p.p.m. range were obtained and results are presented that allow the prediction of the counting rate per mCi and p.p.m. of the impurity content. The performance of the system is discussed concerning its potential applications to in-line monitoring of the wear metals.

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1. Packer, L.L., Järvinen, M.-L. and Sipila, H., Application of Penning Mixture Proportional Counters for Gas T. r bine Engine X-Ray Fluorescence Spectrometer Wear Metal Monitor, Analytical Chemistry, 57, 14271433, 1985.
2. Maddox, W.E. and Kelliher, W.C., X-Ray Fluorescence Analysis of Wear Metals in Used Lubricating Oils, Advances in X-Ray Analysis, 29, 497502, 1986.
3. Conde, C.A.N., dos Santos, J.M.F., The Recessed Source Geometry for Source Excited X. R. y Fluorescence Analysis, Advances in X. R. y Analysis, 29, 545550, 1986.
4. Conde, C.A.N. and dos, J.M.F. Santos, The Gas Proportional Scintillation Counter as a Low Energy X-Ray Photon Detector for Industrial Applications, presented at the “12th Symposium of the IMEKO. echnical Committee TC-2 on Photon Detectors”, Varna, Bulgaria, 21-23 May 1986. Submitted for publication in the Proceedings of this Conference (CIE. ournal, 1986/87).
5. Isotope Products Laboratories, 1800 N. Keystone Street, Burbank, California 91504, U. S. A..

The Efficiency of the Recessed Source; Geometry for EDXRF Analysis of Metal Impurities in Oils

  • J.M.F. dos Santos (a1), C. A. N. Conde (a1), L. F. Requicha Ferreira and A. J. De Campos (a1)

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