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KEYWORDS X-ray tube has been used for selective M sub-shell excitations in a single reflection set-up for Pt, Au, Pb, Th and U required for M sub-shell fluorescence cross-sections measurements. Weighted photon energy and total intensity of the incident flux between EM5 edge and tube anode voltage were evaluated following a specific procedure. Comparison of measured crosssections with the calculated ones from existing DHS/DF model based theoretical data on atomic parameters lend support to the present findings.M sub-shell X-rays Selective excitation Bremsstrahlung X-rays Variable energy photons X-ray tube photon source X-ray fluorescence cross-section

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The non-radiative shifting of vacancy from L2 to L3 sub-shell, Coster–Kronig yield f23, is measured for W, Pt, Pb and U using the selective excitation technique for L2 and L3 sub-shell electrons in a compact tri-axial double-reflection geometrical setup with minimum scattered background. The setup consists of a low-power x-ray tube with Rh anode as a photon source, primary exciter for L2 and L3 sub-shells of an experimental target and the experimental target itself in one plane and a Si-PIN detector to record the emitted x-rays from the experimental target in the perpendicular plane. A separate experimental procedure has been adopted in a 90° single-reflection setup both to determine the exciting photon flux that strikes at the experimental target and to nullify exactly the irrelevant L x-rays produced by tube photons which are scattered from the primary exciter. The procedure leads to reduction of probable errors in the measurements and authenticity of determined values.