Fluorescence X-ray field for radiation dosemeters calibration

Area of Science:

• Medical Physics
• Radiation Dosimetry
• Metrology

Background:

• The Facility of Radiation Standards at the Japan Atomic Energy Agency re-established a fluorescence X-ray calibration field.
• This field is essential for calibrating dosemeters in a specific X-ray energy range.
• Existing calibration fields in Japan did not cover this specific fluorescence X-ray spectrum.

Purpose of the Study:

• To establish a reliable irradiation environment for dosemeter calibration using fluorescence X-rays.
• To determine reference air kerma rates accurately within this specialized field.
• To derive necessary correction factors for measurements using fluorescence X-rays.

Main Methods:

• Re-establishment of the fluorescence X-ray calibration field.
• Determination of reference air kerma rates using calibrated reference ionization chambers.
• Correction of measurements to account for energy differences between fluorescence X-ray and narrow-spectrum calibration fields.
• Derivation of conversion coefficients and air density correction factors from measured X-ray spectra.

Main Results:

• Successful re-establishment of the fluorescence X-ray calibration field.
• Determination of reference air kerma rates for the new field.
• Calculation of correction factors essential for accurate dosimetry in this specific X-ray environment.
• Generation of data for conversion coefficients and air density corrections, including values beyond the ISO 4037 standard.

Conclusions:

• The re-established fluorescence X-ray calibration field provides a vital standard for dosemeter calibration in Japan.
• Accurate reference air kerma rates and necessary correction factors have been determined.
• This work enhances the accuracy and reliability of radiation measurements for fluorescence X-ray fields, addressing a gap in national metrology standards.