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A comprehensive summary of x-ray ionization cross section references covering the proton energy range up to 500 keV is also included. It was found that even though the data were lower than those expected by the BEA theory, they lie on a universal curve. Using the most recent values of K-shell fluorescent yields, x-ray ionization cross sections were calculated and compared to theoretical predictions based on the binary encounter approximation (BEA) model. The characteristic x-rays were measured with high resolution Si(Li) detectors. The remaining data were taken with the SUNY College at Cortland 400 keV Van de Graaff generator. The East Texas State University 150 keV Cockcroft-Walton accelerator was used to study Ni K-shell x-rays produced by 90 to 150 keV protons. Similar measurements with 130 to 415 keV protons were made for Ti, Mn, Fe, Cu, and Zn. The total thick target yield of K-shell x-rays produced in Ni by incident protons over the energy range 90 to 415 keV was measured. International Nuclear Information System (INIS) Characteristic K-shell x-ray production by protons below 500 keV
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