Calibration of a NaI spectrometer in dose equivalent quantities

Area of Science:

• Medical Physics
• Radiation Dosimetry

Background:

• Accurate calibration of radiation detection equipment is crucial for reliable dose assessment.
• Sodium iodide spectrometers are commonly used in radiation monitoring and require precise calibration for dose equivalent quantities.

Purpose of the Study:

• To calibrate a sodium iodide spectrometer for dose equivalent quantities.
• To establish a calibration method based on X-ray spectral characteristics and detector response.

Main Methods:

• The sodium iodide spectrometer was calibrated using 12 ISO X-ray qualities ranging from 33 keV to 248 keV.
• Calibration involved correlating known dose equivalents with a linear combination of detector counts across six energy ranges.

Main Results:

• The calibration method allowed for the evaluation of effective dose equivalent, whole-body dose equivalent, and testes dose equivalent.
• Relative deviations from reference values ranged from -21% to +11% for parallel irradiation.

Conclusions:

• The developed calibration method provides a viable approach for determining dose equivalent quantities with a sodium iodide spectrometer.
• The results demonstrate the feasibility of using spectral information for spectrometer calibration in radiation protection.