Conversion coefficients and air density correction factors for new operational quantities in monoenergetic photon calibration fields.

Abstract

In response to the new operational quantities proposed in ICRU Report 95, we calculated conversion coefficients for monoenergetic photon calibration fields-specifically, the²⁴¹Amγ-ray calibration field and the fluorescence x-ray calibration field-both of which are listed in the annex of the ISO 4037 standard series. These coefficients were derived using the measured photon fluence spectrum. Additionally, correction factors for air density were determined for the low-energy fluorescence x-ray calibration field. Both the conversion coefficients and the air density correction factors were found to vary within the standard uncertainty specified by the ISO 4037 series.