1·These materials are known as "radioisotopes" -versions of an element that, because they have an abnormal number of neutrons, frequently decay and release radiation.
这些物质被称作“放射性同位素”—同一种元素的变种，他们具有异常的中子数量，频繁的衰变和放出辐射。
2·Certain radioisotopes can also be administered to treat certain cancers such as thyroid cancer.
管理的某些放射性同位素也可以治疗某些癌症，如甲状腺癌。
3·Today many radioisotopes are produced using the particle accelerator called a cyclotron.
今天许多放射性同位素是用被称为回旋加速器的粒子加速器来制造的。