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汉语拼音：fàng shè xìng yuán sù

能发出射线而衰变成另一种元素的化学元素，如镭、铀、钚、钫。

• He said detection of the radioactive element caesium outside the No. 1 reactor today was "a bad sign" for a core meltdown.

  他说今天在第一核电站检测到放射性元素铯，这是核心融化的不好迹象。

• I shall now speak to you of the experiments which have led us to obtain by transmutation new radioactive elements.

  我现在跟诸位讲讲那些使我们通过蜕变法获得新的放射性元素的实验。

• His advice to Purdue: Look for evidence that the changes in radioactive decay on Earth vary with the rotation of the sun.

  他向普渡大学的研究者提出建议：寻找地球上放射性元素衰变速率的变化同太阳自转的关系。

• Radiation from patients decreases both as the iodine dose is flushed out of their bodies and as it loses strength.

  患者体内碘元素的放射性会随着放射性元素从患者体内的排出和其自身放射性的衰退而减弱。

• She measured the amount of radioactivity, an atomic property, and felt that the radioactivity was proportional to the amount of the element.

  她测量了这两个元素放射性的总量和原子性质，感觉到物质的放射性是同放射性元素的总量成比例的。

• Some medicines, like Prussian blue pills, can help expel radioactive elements from the body.

  普鲁士蓝药片等药物可以帮助将放射性元素排出体外。

• Some debris fell down near the site, but radioactive elements were carried by the winds across Europe.

  一些碎片掉落在核电站附近，但放射性元素随风扩散到整个欧洲。

• It is a very unstable area and will not prevent the disbursement of lethal radioactive elements to the environment.

  这是一个非常不稳定的地区，将不能阻止致命放射性元素支付环境。

• The field investigation opens out the secret of the harm by radioactive elements to the health of some villagers around Anshan.

  通过实地调查，揭示了鞍山周边部分村民受放射性元素致害之迷。