后装放射源到位精度的测试与校准是肿瘤后装近距离治疗质量保证的重要内容之一，放射源能否准确到位是后装近距离治疗能否达到预期目的的重要前提。本文介绍一种简单可靠的后装源到位精度测试与校准方法。1后装源到位精度的测试1．l材料普通相纸（如公元牌3号照相纸，中国... Testing and calibration of the in-position accuracy of the after-loaded radioactive sources is one of the important contents of the quality assurance of the brachytherapy after the tumor is installed. Whether the radioactive sources can be accurately placed is an important prerequisite for whether or not the post-brachytherapy can achieve the expected purpose. This article presents a simple and reliable method for testing and calibrating the accuracy of a post-mount source. 1 after the installation of source precision test 1. l material ordinary photo paper (such as the 3rd AD photo paper, China ...