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汉语拼音：fàng shè xìng tóng wèi sù

某元素的具有放射性的同位素。如自然界中的碳元素有碳12(126c)、碳13(136c)和碳14(146c)等几种同位素，其中126c和136c是稳定同位素，146c的原子核不稳定，具有放射性，为放射性同位素。分天然放射性同位素和人工放射性同位素两大类◇者占绝大多数。广泛应用于医疗、工业、农业和科学研究等方面。

• Another result of the widespread adoption of PCR was that radioisotopes would no longer be used in DNA-based forensic investigation.

  PCR的普遍采用的另一个结果是放射性同位素不再用于基于DNA的法庭调查。

• There was a small release of radioactive steam at Three Mile Island in 1979, and there have also been a few releases at Fukushima Daiichi.

  1979年三里岛核电站事故中便是有少量带放射性同位素的蒸汽泄露。

• On my 12th birthday, I really wanted a titanium centrifuge so, you know, I could separate radioactive isotopes. Of course.

  我12岁生日的时候，我非常想要一个钛离心分离机，这样，我就可以分离放射性同位素了。当然。

• All of the evidence points toward a conclusion that the sun is "communicating" with radioactive isotopes on Earth, said Fischbach.

  所有的证据都指向了太阳正在和地球上的放射性同位素进行“通讯”的结论。

• Howard: They were injecting rats with radioactive isotopes and one of the techs got bit.

  霍华德：他们给老鼠注射了放射性同位素，但其中的一名技术员被咬了。

• The State establishes a system for radioisotope registration. Specific measures shall be formulated by the State Council.

  国家建立放射性同位素备案制度。具体办法由国务院规定。

• A large number of radioactive isotopes among the heavy elements are of three series.

  重元素中的大量放射性同位素分别属于三个系列。

• The city's challenge, chiefly, is to dispose of cesium-137, a radioactive isotope with a half-life of 30 years.

  这座城市面临的最大问题就是处理铯—137，这是一种半衰期为30年的放射性同位素。

• Radionuclide examinations provide considerable information in evaluating patients who have received renal transplants.

  放射性同位素检查可对肾移植患者提供重要的评估资料。