Effect of radiation protection apron defect on radiation dose during fluoroscopy

INTRODUCTION: Occupational exposure should be minimized to a level that is as low as reasonably achievable. Radiation protection aprons and thyroid collars are effective in reducing occupational radiation dose as they typically attenuate at least 90% of scattered radiation. However, cracks and holes may compromise the shielding capacity of the apron. The aim of the study was to quantify change in radiation dose behind defects to support the development of rejection criteria for damaged aprons. Methods: Radiation doses were measured using a calibrated solid-state dosimeter behind eight various-sized defects and compared to dose measured behind an intact apron. Doses were measured using two different fluoroscopy protocols. Results: Mean cumulative radiation doses behind the defects varied from -1.8 - 112.7 % compared to the intact shield depending on defect size and fluoroscopy protocol. Based on average annual fluoroscopy times per operator at Kuopio University Hospital, the use of damaged apron could result in an annual dose increase of 0.01 - 8.3 mGy to personnel. Conclusion: The size of a defect influences the shielding capacity of radiation shields. Therefore, rejection criteria should consider both the size and location of the defect to avoid unnecessary replacement of protective garments. .