The production cross sections , the fluorescence yield , K shell X-ray intensity ratio , the vacancy transfer probabilities from K to L shell , and the level widths for some elements in the atomic range were measured. The samples were excited by 80.998？keV gamma rays from a 10？mCi 133Ba radioactive source. The K X-rays emitted by samples were detected by using a CdTe detector. These parameters have been theoretically calculated, also. The experimental values were compared with the theoretical and semiempirical values. Our experimental values closely agreed with theoretical values and other experimental values. 1. Introduction Accurate experimental values of X-ray fluorescence parameters such as the production cross sections, the fluorescence yields, the intensity ratios, the vacancy transfer probabilities, and the level widths for different elements are important because of their wide use in atomic, molecular, and radiation physics, material science, environmental science, agriculture, forensic science, dosimetric computations for health physics, cancer therapy, elemental analysis, and basic studies of nuclear physics. A vacancy in the inner shell of an atom is produced by various methods; photoionization is one of them. In this method, the incident gamma photon ejects the element electron to the continuum state, creating a vacancy in the inner shell. The fluorescence yield of an atomic shell or subshell is defined as the probability that a vacancy in that shell or subshell is filled through a radiative transition or a nonradiative transition. In recent years, several attempts have been made for measuring X-ray fluorescence cross sections and yields for different elements. Krause et al. [1] have calculated theoretical K and L XRF cross sections. Puri et al. [2] published an extensive table of K shell X-ray fluorescence cross sections for some elements in the energy range 1–200？keV. Bennal et al. [3] measured K X-ray fluorescence parameters for Ag, Cd, In, and Sn elements. Seven [4] has measured photon induced K X-ray cross sections for some heavy elements. Hubbell et al. [5] have collected more recent experimental values of . Theoretical values of were obtained in the region by McGuire [6, 7]. Chen et al. [8] used a Dirac-Hartree-Slater approach to calculate the values of elements in the atomic range . Bambynek et al. [9] have fitted their collection of selected most reliable experimental values of in the range. The , , and total K X-rays fluorescence cross sections and the average fluorescence yields for six elements with at 5.96？keV have been measured
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