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Updated: Jun 11, 2025
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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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Radiation shielding transmission data for modern digital radiography.
Xinhua Li1, Theodore A Marschall1, Kai Yang1
1Division of Diagnostic Imaging Physics, Department of Radiology, Massachusetts General Hospital, Boston, Massachusetts, USA.
Medical Physics
|October 9, 2024
Summary
Modern digital radiography (DR) systems show increased x-ray beam filtration compared to older systems. This updated data aids in accurate structural shielding evaluations for radiography facilities.
Area of Science:
- Medical Physics
- Radiological Sciences
- Radiation Protection
Background:
- Radiography is a key x-ray imaging modality.
- Previous data (NCRP Report No. 147) evaluated systems installed before 2000.
- US regulations increased minimum half-value layer (HVL) for x-ray systems manufactured after June 10, 2006.
Purpose of the Study:
- To determine the x-ray beam transmission of modern digital radiography (DR) systems through various shielding materials.
- To provide updated data for structural shielding calculations.
Main Methods:
- Measured half-value layers (HVLs) for two DR systems (Agfa DR 600, GE Revolution XR/d) between 60-120 kV.
- Utilized Monte Carlo (Geant4) simulations to compute transmission through lead, concrete, gypsum, and steel.
- Fitted transmission data using the Archer equation.
Main Results:
- HVLs were consistent between the two DR systems with default filtration (median difference 2.1%).
- Additional filtration (1 mm Al + 0.1 mm Cu) increased HVLs by 45.2%-61.2%.
- Transmission parameters were generated for 60-120 kV at two filtration levels.
Conclusions:
- Modern DR systems exhibit greater x-ray beam filtration than those evaluated in NCRP Report No. 147.
- The presented transmission data are crucial for accurate structural shielding assessments.
- Updated data supports evaluations for specific tube voltages and workload distributions.
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