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Personal dose equivalent conversion coefficients for photons to 1 GeV.
1Y-12 National Security Complex, PO Box 2009, MS 8105, Oak Ridge, TN 37831-8105, USA. veinotkg@y12.doe.gov
Radiation Protection Dosimetry
|December 15, 2010
Summary
This study calculates conversion coefficients for personal dose equivalent (H(p)(d)) up to 1 GeV, providing crucial data for calibrating personal dosemeters and improving radiation protection assessments.
Area of Science:
- Medical Physics
- Radiation Dosimetry
- Nuclear Engineering
Background:
- Personal dose equivalent (H(p)(d)) is vital for approximating effective dose in dosemeter calibration.
- Existing conversion coefficient data for photons at higher energies are limited.
- Operational radiation protection uses specific depths (0.007 cm, 1 cm, 0.3 cm) for H(p)(d) approximations.
Purpose of the Study:
- To calculate conversion coefficients for personal dose equivalent (H(p,slab)(d)) up to 1 GeV.
- To provide data for H(p,slab)(10), H(p,slab)(3), and H(p)(0.07).
- To compare calculated coefficients with ICRP recommendations for effective dose.
Main Methods:
- Calculated conversion coefficients using kerma approximation and secondary charged particle tracking.
- Determined conversions from air kerma to H(p,slab)(d).
- Investigated the influence of air on secondary particle production by performing calculations in vacuo and in air.
Main Results:
- Conversion coefficients for H(p,slab)(10) and H(p,slab)(3) were computed up to 1 GeV.
- Coefficients for H(p)(0.07) were calculated up to 10 MeV.
- Analytical fits for the energy range and comparisons with ICRP guidance were provided.
Conclusions:
- The study extends conversion coefficient data for personal dose equivalent to higher photon energies.
- The findings support more accurate dosemeter calibration and radiation protection practices.
- The inclusion of air's influence provides a more realistic assessment of dose equivalents.
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