Yrkeseksponering for elektromagnetiske felt blant radiografer ved bruk av magnetisk resonans

In July 2016, the EU Electromagnetic Field Directive (Direktiv2013/35/EU, 2013) entered into force. Previous studies have shown that the action and limit values in the Directive can not be met when working with magnetic resonance imaging. This study aimed to measure the exposure to electromagnetic fields within a group of radiographers employed at two hospitals in Denmark and identify factors that influences the level of exposure. The results were compared to the action and limit values in the EU Directive. A cross-sectional study design was used and the data collection was two-folded. A personal dosimeter was used to collect exposure data. A questionnaire was used to map the participants' background, work tasks and working hours. 42 participants were included, resulting in 79 measurements. Average exposure to static magnetic fields and time-varying magnetic fields were 41 mT and 15 mTs-1, respectively. Average peak exposure were 616 mT and 1188 mTs-1, respectively. Significant determinants for higher exposure levels were preparation of the scanner, working around an open 1T scanner compared to closed scanners at 1,5T and 3T, respectively, and work at Hospital A compared to Hospital B. Such information can be useful when planning measures to reduce occupational exposure. Limit values for static magnetic fields are met. Action levels for motion induced time-varying magnetic fields are not met. This emphasizes the employer's responsibility to keep exposure as low as possible