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[Quantitative Evaluation of Evacuation Criteria Based on Scattered Radiation Shielding Performance of a Protective
Yuki Sato1, Kojiro Ono2, Kana Hatsumi1
1Department of Radiological Technology, St. Marianna University Hospital.
Purpose:
Portable dynamic chest radiography (DCR) offers high clinical utility but also raises concerns about increased scattered radiation exposure to surrounding personnel. This study aimed to optimize radiation protection by quantitatively assessing the shielding performance of a protective screen and by evaluating evacuation criteria.
Methods:
Scattered radiation was measured using an anthropomorphic phantom and an ionization chamber-type survey meter under various imaging conditions, with and without a mobile protective screen (0.25 mmPb equivalent). Four quantitative indicators were introduced: dose reduction ratio (DR ratio), evacuation area (EA), evacuation area ratio (EA ratio), and evacuation distance (ED).
Results:
Use of the protective screen reduced scattered radiation by over 80%, expanded the EA by up to 55.5%, and shortened the ED by more than 100 cm. These findings indicate its effectiveness in creating safer imaging environments in limited spaces.
Conclusion:
The proposed indicators provide an objective method for assessing the shielding performance of protective screens in portable DCR. These results support the development of evacuation criteria to reduce exposure for healthcare workers and nearby patients.
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