| Cao Jinping,Liu Guoqing,Xu Hui,et al.Measurement and analysis of radiation dose in the workplace using portable intra-oral X-ray machines[J].Chinese Journal of Radiological Medicine and Protection,2026,46(3):288-293 |
| Measurement and analysis of radiation dose in the workplace using portable intra-oral X-ray machines |
| Received:March 17, 2025 |
| DOI：10.3760/cma.j.cn112271-20250317-00030 |
| KeyWords:Portable intra-oral X-ray machine Radiation dose Scatter radiation Radiation safety |
| FundProject: |
| Author Name | Affiliation | E-mail | | Cao Jinping | China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Liu Guoqing | China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Xu Hui | China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | xuhui@nirp.chinacdc.cn | | Zhao Qiaoqiao | China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Yue Baorong | China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | |
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| Abstract:: |
| Objective To analyze both the radiation dose rate distribution in the radiation field and the resulting radiation doses to operators when using a portable dental intra-oral machine. Methods A CT head phantom and a standard water phantom were used to simulate the examined patient. The operator simulated the actual clinical procedure by taking intra-oral radiographs using a certain portable intra-oral X-ray machine. An AT1123 X-γ-ray dosimeter was used to measure the radiation doses to the operator's head (eye lens), thyroid gland, chest, left hand, right hand, abdomen, gonad, and feet. Additionally, the ambient dose equivalent rates were measured at 1.0, 1.5, and 2.0 m in the 0-360° direction and at a height of 105 cm above the ground within the radiation field centered on the head phantom. Results The dose rates outside the lead rubber X-ray protective clothing measured 196.4-1 334.9 μSv/h, with the maximum and minimum dose rates observed at the thyroid and the foot, respectively. The dose rates at the hands were determined at 197.9-459.9 μSv/h. In contrast, inside the 0.5 mm Pb personal protective equipment (lead rubber protective neck collar and apron), the attenuation ratios of the ambient dose equivalent rates at different measurement positions all exceeded 98%. Conclusions The indoor operation of portable intra-oral dental X-ray machines induces high dose rates. Therefore, protective measures should be enhanced for both medical staff and the surrounding individuals. Personal protective equipment proves effective in reducing radiation doses to operators of portable intra-oral dental X-ray machines. |
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