Extremity radiation exposure in nuclear medicine is a growing concern because it may surpass the maximum permissible dose of 500 mSv. This study aimed to assess the occupational finger dose received by technologists during the preparation and administration ofF-FDG radiopharmaceuticals in positron emission tomography-computed tomography (PET-CT) whole-body scan procedures. Fifty scans were selected, with one procedure excluded due to a high administered activity. The mean administered activity per scan was 207.2 ± 41.8 MBq, with preparation and administration times averaging 1.44 ± 1.30 min and 0.46 ± 0.31 min, respectively. The technologist's mean total finger dose received during preparation and administration was 253.5 ± 153.3 Sv per procedure. A significant positive correlation was found between the administered activity and occupational dose, with patient's body mass index, preparation time, and administration time also contributing to dose variation. Based on 703 PET-CT procedures conducted in 2022, the estimated occupational finger dose for a technologist was 178.2 mSv annually. This value is well below the International Commission on Radiological Protection's maximum permissible dose of 500 mSv. The findings of this study have a significant impact on extremity dosimetry in nuclear medicine in Sri Lanka, as this is the first study of its kind.
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Article Synopsis
- Clinical imaging techniques like PET combined with CT are becoming more common in biomedical research with small animals, but handling radioactive substances requires strict regulations and training to ensure safety.
- This paper outlines the requirements set by the Radiation Protection Act and associated regulations, with a focus on practical steps in PET/CT imaging, from receiving radiopharmaceuticals to waste disposal.
- An analysis of radiation doses over four years in a small animal imaging facility showed that personnel exposure is generally lower than in human PET/CT imaging, remaining well within legal limits.
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