The positron annihilation technique was applied to study the relation between relative free volume and irradiated graft for PTFE.
用正电子湮没技术研究在聚四氟乙烯辐照接枝过程中的自由体积与正电子湮没寿命谱的关系。
Volumes greater than the tumour volume are irradiated to compensate for both setup and target outline errors.
为了补偿设置和耙区轮廓误差，真正的照射体积往往大于肿瘤体积。
Volumes greater than the tumour volume are irradiated to compensate for both setup and target outline errors.
为了补偿设置和耙区轮廓误差，真正的照射体积往往大于肿瘤体积。
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