关键词: 半身照射, 仿真人体模型, 剂量分布

Abstract: Abstract:Objective To study the security of low dose and half-body irradiation by ⁶⁰Co γ-rays as a new method of clinical radiotherapy．Methods The simulated manikin was used to simulate human body and two radiation modalities of facing and backing on radioactive source were adopted．Half-body irradiation was done by ⁶⁰Co γ-rays with doses of 9，10 and 11 cGy．The exposure dose of every layer and important target organs in the simulated manikin were detected,and the security of low dose and half-body irradiation as a therapeutic method was evaluated．Results The exposure dose of every layer and sensitive organs were all within safety margin,when simulated manikin facing or backing on the radioactive source was irradiated by ⁶⁰Co γ-rays with doses of 9,10 and 11 cGy．Further，the exposure dose of sensitive organs in the simulated manikin backing on the radioactive source was lower than that in those facing the radioacive source．Conclusion The method of low dose and half-body irradiation as a radiotherapeutic method is safe and feasible and the radiation modality of backing on the radioactive source is more safe．

Key words: half-body irradiation, simulated manikin, dose distribution