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Updated: Jan 18, 2026
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Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
Published on: March 11, 2021
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Conversion coefficients and air density correction factors for new operational quantities in monoenergetic photon
Tomoya Tsuji1, Hiroshi Yoshitomi1, Sho Nishino1
1Department of Radiation Protection, Nuclear Science Research Institute, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan.
Summary
New conversion coefficients were calculated for photon calibration fields following ICRU Report 95 guidelines. These calculations, using measured photon spectra, align with ISO 4037 standards, ensuring accuracy in radiation dosimetry.
Area of Science:
- Medical Physics
- Radiation Dosimetry
- Metrology
Background:
- ICRU Report 95 introduced new operational quantities for radiation protection.
- Existing calibration fields, such as 241Am gamma rays and fluorescence X-rays (ISO 4037), require updated conversion coefficients.
- Accurate conversion coefficients are essential for reliable radiation dose assessment.
Purpose of the Study:
- To calculate conversion coefficients for monoenergetic photon calibration fields.
- To determine air density correction factors for low-energy fluorescence X-ray fields.
- To validate these coefficients and factors against ISO 4037 standards.
Main Methods:
- Utilized measured photon fluence spectra for calculations.
- Applied new operational quantities from ICRU Report 95.
- Determined air density correction factors for specific calibration fields.
Main Results:
- Calculated conversion coefficients for 241Am gamma-ray and fluorescence X-ray calibration fields.
- Derived air density correction factors for low-energy fluorescence X-ray fields.
- Observed variations in coefficients and factors within ISO 4037 standard uncertainties.
Conclusions:
- The calculated conversion coefficients and air density correction factors are consistent with international standards.
- These findings support the accurate implementation of new operational quantities in radiation dosimetry.
- The study provides essential data for metrology and radiation protection applications.
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