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Updated: Mar 22, 2026
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Dosimetry for Cell Irradiation using Orthovoltage 40-300 kV X-Ray Facilities
Published on: February 20, 2021
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X-ray spectra and doses.
Johanna Lizbeth Rodriguez-Ibarra1, Pablo Luis Hernandez-Adame1, Hector Rene Vega-Carrillo1
1Unidad Academica de Estudios Nucleares, Universidad Autonoma de Zacatecas, C. Cipres 10, Fracc. La Peñuela, 98068 Zacatecas, Mexico.
Summary
Monte Carlo simulations calculated X-ray spectra from electron-target collisions. Aluminum filters reduced low-energy photons, significantly lowering Kerma in air at 20cm.
Area of Science:
- Medical Physics
- Radiation Physics
Background:
- Accurate X-ray spectrum calculations are crucial for radiation dosimetry.
- Understanding the impact of target materials and filtration is essential for optimizing X-ray beam properties.
Purpose of the Study:
- To calculate X-ray spectra using the Monte Carlo method for Tungsten (W), Rhodium (Rh), and Molybdenum (Mo) targets.
- To evaluate the effect of Aluminum (Al) filtration on X-ray spectra and associated dose quantities.
- To assess dose metrics like Kerma in air, Ambient dose equivalent, and Personal dose equivalent.
Main Methods:
- Utilized the Monte Carlo method for simulating X-ray spectra.
- Calculated spectra at varying distances (20, 50, 100cm) from the focal point.
- Performed simulations with and without Al filters to analyze filtration effects.
Main Results:
- X-ray spectra exhibited continuous bremsstrahlung and characteristic X-rays, dependent on the target material.
- An Aluminum filter effectively attenuated low-energy photons (<40keV).
- The most significant dose reduction for Kerma in air was observed at 20cm.
Conclusions:
- Monte Carlo simulations provide valuable insights into X-ray spectral characteristics and dose estimations.
- Aluminum filtration is effective in reducing low-energy X-ray exposure, particularly at closer distances.
- Target material selection and filtration are critical parameters in radiation protection and diagnostic imaging.
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