PET 검사실 종사자의 업무 행위 별 방사선피폭 조사에 따른 피폭선량 저감화를 위한 연구

A study on the strategies to lower technologist occupational exposure according to the performance form in PET scan procedure

Purpose For nuclear medicine technologists, it is difficult to stay away from or to separate from radiation sources comparing with workers who are using radiation generating devices. Nuclear medicine technologists work is recognized as an optimized way when they are familiar with work practices. The aims of this study are to measure radiation exposure of technologists working in PET and to evaluate the occupational radiation dose after implementation of strategies to lower exposure. Materials and Methods We divided into four working types by QC for PET, injection, scan and etc. in PET scan procedure. In QC of PET, we compared the radiation exposure controlling next to ⁶⁸Ge cylinder phantom directly to controlling the table in console room remotely. In injection, we compared the radiation exposure guiding patient in waiting room before injection to after injection. In scan procedure of PET, we compared the radiation exposure moving the table using the control button located next to the patient to moving the table using the control button located in the far distance. PERSONAL ELECTRONIC DOSEMETER (PED), Tracerco™ was used for measuring exposed radiation doses. Results The average doses of exposed radiation were 0.27±0.04 μSv when controlling the table directly and 0.13±0.14 μSv when controlling the table remotely while performing QC. The average doses of exposed radiation were 0.97±0.36 μSv when guiding patient after injection and 0.62±0.17 μSv when guiding patient before injection. The average doses of exposed radiation were 1.33±0.54 μSv when using the control button located next to the patient and 0.94±0.50 μSv when using the control button located in far distance while acquiring image. As a result, there were statistically significant differences(P<0.05). Conclusion: From this study, we found that how much radiation doses technologists are exposed on average at each step of PET procedure while working in PET center and how we can reduce the occupational radiation dose after implementation of strategies to lower exposure. And if we make effort to seek any other methods to reduce technologist occupational radiation, we can minimize and optimize exposed radiation doses in department of nuclear medicine. Conclusion From this study, we found that how much radiation doses technologists are exposed on average at each step of PET procedure while working in PET center and how we can reduce the occupational radiation dose after implementation of strategies to lower exposure. And if we make effort to seek any other methods to reduce technologist occupational radiation, we can minimize and optimize exposed radiation doses in department of nuclear medicine.