由放射性钠衰变产生正电子，冷却后形成一个由大约100万个正电子组成的体积同样大小的粒子云团，这团正电子被存放在相邻的一个容器中。
The positrons, produced by the decay of radioactive sodium, are cooled into a similarly sized cloud of around 1m particles and held in a neighbouring trap.
目的探讨肿瘤放射增敏剂希美钠在鼻咽癌放射治疗的增敏作用和临床价值。
Objective To discuss the clinical value and sensitizing effect of tumor radiosensitizer in the radiation therapy of Nasopharyngeal Carcinoma.
同时，来自放射性钠一种形式的衰减正电子被慢慢分开且累积起来。
Meanwhile, positrons from the decay of a form of radioactive sodium are separately slowed and accumulated.
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