Study of the Positioning Influence in the Water Activity Measurement during Leak Test of Iodine-125 Seeds

In the prostate cancer treatment, brachytherapy with iodine-125 seeds has been used. lodine-125 seeds are sealed radioactive sources, made by a titanium capsule containing the radioisotope inside. In the final phase of the seeds production, it is necessary to ensure that there is no leakage of the radioactive material. A leakage test is performed, immersing the seeds in water during 24 h and measuring the resulting activity in the water. This measurement is made in a sodium iodide detector. The immersion water is transferred to a plastic tube with a cap. The tube is placed by an automated positioning system, in the detector chamber. This study aims to determine the best positioning of the tube for the detection. It is also important to determine the influence of the positioning variation intrinsic of the automated positioning system during the iodine-125 seeds production. The results obtained will be used as a reference to adjust the equipment and process control system, in the production of the iodine-125 seeds.

现代化大型酒店高端幕墙中的科技创新技术应用与实践

澳门地区银河四期项目幕墙具有形式变化多样、弯曲构件多、型材加工困难、玻璃单元尺寸大、单元构件数量多、工期要求紧、质量要求高等特点。通过对高端幕墙综合体项目施工难点分析,应用自动生产线、智能化检测、三维扫描、RFID仿伪追溯系统、自动试水系统等科技创新技术,顺利解决了幕墙在前期生产、加工、出货等方面存在的问题,以期为后续幕墙施工进度、品质安全、质量目标的实现提供有力保障。