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Radiation shielding transmission data for modern digital radiography.

Xinhua Li1, Theodore A Marschall1, Kai Yang1

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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.

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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.