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Eighteen-Month Personnel Monitoring Dosimetry Results Using a Suspended Radiation Protection System with Face Shield


A. Lichliter, B. Yoder, C. Rees

Abstract Number

Purpose: To determine the radiation doses at the waist and eye for an interventionalist performing a wide variety of procedures over an extended period using the suspended protection system (SPS) (Zero-GravityTM, TIDI Products, Neenah, WI). Materials and Methods: One interventionalist wore two personnel monitoring dosimeter badges (optical stimulating luminescence, Luxel+, Landauer, Glenwood, IL), one at the front waist and one on the cap near the left eye, when performing procedures using SPS. The SPS includes a 0.5-mm Pb-acrylic face shield encompassing an arc in the front and to the sides of the operator and a 1-mm Pb apron. Reports for 18 consecutive months were retrospectively reviewed, along with corresponding technical information for the same procedures, including fluoroscopy minutes, total patient dose-area-product (DAP), and fluoroscopic DAP. Background controls were subtracted out by the manufacturer using standard industry method. Data for the substantially fewer procedures in which the operator used a standard lead apron and different dosimeters are not included in this study. Results: A total of 299 procedures were performed, including vascular and nonvascular interventions of the chest, abdomen, pelvis, and extremities (e.g., chemo- and radio-embolization, transjugular intrahepatic portosystemic shunt, genitourinary and biliary interventions, others). The total deep dose equivalent (DDE) over 18 months were 0 mRem for the waist and 11 mRem (0.11 mSv) for the eye. The lens dose equivalent (LDE) was 11 mRem (0.11 mSv). Eye DDE is relevant to the brain. The average annual background exposure is 320 mRem (3200 μSv) or 80 mRem (800 μSv) without radon. This is compared with annualized left eye exposure of a practicing interventionalist using SPS in this study of 7.33 mRem (73.3 μSv). The annual occupational exposure limits to the lens of the eye are 15,000 mRem in the United States and 2000 mRem in Europe. Conclusions: Eye exposures during clinical practice using the SPS were exceedingly low in this study, far lower than reports of mobile shields, and represent a 9% increase above background without radon. Waist dose was not detectable.

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