AimTo evaluate radiation dose among physicians, nurses, nuclear medicine (NM) technicians and radiographers at a single institution and to compare the difference in measured dose during COVID-19 with other periods. Materials and MethodsA retrospective analysis of the occupational radiation doses received by all workers in diagnostic radiography and NM departments at a single institution during a 5-year period (2018-2022) was performed. Dose measurement were recorded for 94 radiology personnel; radiographers, NM technicians, physicians, and nurses. In addition to descriptive statistics, Mann-Whitney U-test was used to compare the average annual effective-dose between male and female workers and between the periods before and during Covid-19. Kruskal-Wallis test was used to compare effective radiation dose from different quadrants. ResultsThe annual average effective doses were found to be between 0.58-0.72mSv for males and 0.68-0.85mSv for females. All radiographers, 86% of nurses and 69% of physicians have received annual average effective doses below 0.99mSv. The average annual effective dose for all radiation workers were similar in the period before Covid-19 when compared to period during Covid-19 except for nurses who had significantly lower (P<0.05) dose before Covid-19. ConclusionsThe average annual effective doses of radiation workers during 2018- 2022 were well below the annual dose limit. A relatively higher average effective dose was received among NM technicians compared with other radiation occupational workers. While the caseload during COVID-19 pandemic was lower due to government policies, the radiation dose to health care workers during the pandemic was similar to that before the pandemic.