Abstract
Recently, there is a strong demand for a high energy, high dose X-ray, which can penetrate thick objects well and provide a good visualization of their inner structures. Normally, such an X-ray can be generated by electron linear accelerators (linacs) with bremsstrahlung. It is necessary to develop a simple formula to estimate the X-ray dose rate from electron linacs. In this paper, we propose a mathematical model to estimate the X-ray dose rate of electron linacs. First, the FLUKA Monte Carlo code has been performed to evaluate the radiation dose due to the bremsstrahlung for different thicknesses of tungsten targets and electron energies. Then, a mathematical model is developed by applying the linear least-squares fitting on the simulated data. It is found that the model is accurate enough to estimate an X-ray dose rate of any electron linacs with a thick tungsten target. A comparison between the simulated and estimated dose rate shows that the mean absolute percentage error is approximately 3%, with the maximum error of 8%. Therefore, this mathematical model could be an alternative way to estimate an X-ray dose rate of an electron linac with a thick tungsten target analytically.
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