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KMID : 0364920220470010039
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Journal of Radiation Protection and Research
2022 Volume.47 No. 1 p.39 ~ p.49
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Experimental Evaluation of Scattered X-Ray Spectra due to X-Ray Therapeutic and Diagnosis Equipment for Eye Lens Dosimetry of Medical Staff
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Kowatari Munehiko
Nagamoto Keisuke
Nakagami Koich
Tanimura Yoshihiko
Moritake Takashi
Kunugita Naoki
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Abstract
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Background: For proper monitoring of the eye lens dose, an appropriate calibration factor of a dosimeter and information about the mean energies of X-rays are indispensable. The scattered X-ray energy spectra should be well characterized in medical practices where eye lenses of medical staffs might be high.
Materials and Methods: Scattered X-ray energy spectra were experimentally derived for three different types of X-ray diagnostic and therapeutic equipment, i.e., the computed tomography (CT) scan, the angiography and the fluoroscopy. A commercially available CdZnTe (CZT) spectrometer with a lead collimator was employed for the measurement of scattered X-rays, which was performed in the usual manner.
Results and Discussion: From the obtained energy spectra, the mean energies of the scattered X-rays lied between 40 and 60 keV. This also agreed with that obtained by the conventional half value layer method.
Conclusion: The scattered X-rays to which medical workers may be exposed in the region around the eyes were characterized by means of spectrometry. The obtained mean energies of the scattered X-rays were found to match the flat region of the dosimeter response.
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KEYWORD
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Eye Lens Dosimetry, Medical Staff, Scattered X-Ray, Unfolding, CdZnTe Spectrometer
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