Assessment of the effective dose and cancer risk for medical occupational workers in Republic of Yemen from 2001 to 2021


Assessment of the effective dose and cancer risk for medical occupational workers in Republic of Yemen from 2001 to 2021

S.J of NATEC, No.2, November, 2023. National Reference Serial Number: 255 – 2022


Kh.A. Al-Shamiri1, Z. Eadan*1, M.K. Al-Motawakel2, J. Shamhan1

1 National Atomic Energy Commission of Yemen (NATEC)-Sana’a

2 Physics Department, Faculty of Science, Sana’a University-Sana’a


This study aims to assess the annual average effective dose and cancer risks for medical radiation workers in Yemen during the period 2001 to 2021. The study included 1,369 radiation workers in ten governorates distributed among 122 hospitals and radiology centers in the field of diagnostic radiology (DR), radiotherapy (RT) and nuclear medicine (NM) departments. The Dose Registry of Radiation Workers through the ndividual radiation monitoring program at the National Atomic Energy Commission of Yemen (NATEC) was used in this study. The results have shown that about 95.399% of workers received dose less than 2.1mSv/y and about 4.058% received doses between 2.1mSv/y and 6mSv/y, which were within  the dose restriction approved by NATEC. Personal effective dose did not exceed 20 mSv/y, except in four cases.The average of annual effective dose of DR, RT, and NM workers were 0.924mSv/y, 1.25mSv/y, and 1.453mSv/y respectively. The average of accumulative dose for medical workers was 17mSv for males and 5mSv for females. Based on the ICRP-103 model, Excess Relative Risks (ERR) and Excess Absolute Risks (EAR) and 95% Confidence Interval (CI) for the incidence of solid cancer were assessed. After removing risks for doses less than 1mSv, the ERR values ​​for solid cancer per 100 mSv (95%CI) ranged from 0.012(0.01,0.13) – 0.28(0.18,0.37) for males and 0.021(0.02,0.23) – 0.095(0.09,0.10) for females. While the EAR/10,000 values ​​ranged  from  0.084 (0.08 to 0.09) – 1.89 (1.24 to 2.54) for males and 0.12 (0.11 to 0.13) – 0.55 (0.50 to 0.59) for females.

The results of occupational radiation dose showed that most of the monitored workers are committed to radiation protection procedures and the regulatory control applied by NATEC on radiation activities and practices in Republic of Yemen was effective. Therefore, it is obvious the importance of compliance with NATEC radiation protection procedures  when dealing with radiation techniques.

Keywords: Radiation exposure, Effective dose, excess relative risks (ERR), excess absolute risks (EAR), Radiation protection and safety

2-30112023-21-37 SJ of NATEC


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