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Updated: Jul 18, 2026
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
Calibration of a 137Cs gamma-ray beam irradiator using large size chambers
1National Institute of Standards and Technology, Ionizing Radiation Division, 100 Bureau Drive Building 245, Gaithersburg, MD 20899-8460, USA. rminniti@nist.gov <rminniti@nist.gov>
Abstract:
A (137)Cs gamma-ray beam irradiator has been calibrated in terms of air kerma using large size chambers. The available air-kerma rates range between 1.8 microGy/h (0.2 mR/h) and 5.3 mGy/h (0.6R/h). Large-volume chambers were used to characterize the source in terms of the radiation quantity air kerma (and exposure). Two types of chambers with significantly different characteristics and energy responses were used. This work shows that very good agreement can be obtained between the measurements performed with such different types of chambers. An agreement of 0.3% is observed between chambers even for the lowest air-kerma rates measured.
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