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切割塑料块: 1.将病人的定位片放置在切割机台面上,使射野中心与坐标中心的“十”字重合。 2.将塑料块固定在固定器上,并调节其距离使其与模拟机拍片和治疗机治疗时铅块的位置一致。 3.切割丝通电,手持描笔沿X线定位片的射野边际描迹,塑料块即被切成相应的形状。 铅粒的制作: 将熔化的铅通过铁勺小孔均匀漏入面粥内形成铅粒,铅粒直径一般约2～4mm。对铅粒用~(60)钴γ线测量,半价层为16mm铅粒,防护挡块用8cm厚铅粒,为五个半价层。
Cut the plastic block: 1. The patient’s positioning sheet placed on the cutting machine table, the center of the field and coordinate the center of the “ten” words coincide. 2. Fix the plastic block to the holder and adjust the distance to match the position of the lead block on the analog machine and the treatment machine. 3. Cutting wire power, hand-held pen along the X-ray positioning film radio edge of the trail, the plastic block is cut into the corresponding shape. Lead grain production: The molten lead through spoon holes uniformly leak into the surface porridge to form lead particles, lead particles generally about 2 ~ 4mm in diameter. For lead particles measured with ~ (60) cobalt γ-ray, the half-price layer is 16mm lead particles, the protective stopper with 8cm-thick lead particles, five half price layer.