This prospective observational study to determine occupational radiation doses was performed at the Helsinki University Hospital Endoscopy department between March 2021 and July 2021. The COVID-19 pandemic did not affect the number or type of performed procedures. Altogether 604 consecutive fluoroscopy-guided procedures to patients were included in the study. From these interventions, 560 were ERCPs and 44 were other gastrointestinal endoscopy procedures, such as duodenal stentings or dilatations of anastomotic strictures. Personal dose equivalents H
p(10), H
p(0.07), and H
p(3) for four gastrointestinal surgeons (S1-S4) and four gastroenterologists (G1-G4) and for assisting nurses (N_Zee and N_Cios) were measured using thermoluminescent dosimeters (TLD) and direct-ion storage dosimeters (DIS). Details of dosimetry practices and dose uncertainty estimation are provided as supplementary material. In the endoscopy department, ERCPs for diagnosis and follow up of primary sclerosing cholangitis (PSC) and dilatations and stentings for these patients are performed by gastroenterologists; surgeons perform all other ERCP procedures. Distributions of the performed and assisted procedures by endoscopist and assisting nurse are given in Table 1 s (supplementary materials). The study was approved by the Institutional Review Board and no patient informed consent was required.
