| 1. | The rate at which radioactive elements disintegrate varies from one element to another .
放射性元素的衰变速度随元素种类的不同而不同。 |
| 2. | The decomposition of a radioactive element is the simplest example of a true first order reaction .
放射性元素的衰变是真正一级反应最简单的实例。 |
| 3. | Petrographically and mineralogically similar rocks quite often have different concentrations of radioactive elements .
岩石学矿物学上类似的岩石，其放射性元素丰度却往往有所不同。 |
| 4. | " in recognition of their synthesis of new radioactive elements
合成了新的放射性元素 |
| 5. | Nonuniformity of radionuclides distributing in granite
花岗岩中放射性元素分布的不均匀性 |
| 6. | Radium and uranium are radioactive elements
镭和铀是放射性元素 |
| 7. | A naturally occurring or artificially produced radioactive element
放射性元素自然产生或人为制造的放射性元素 |
| 8. | These artificial radio - elements behave in all respects like the natural radio - elements
这些人造的放射性元素在各方面的表现和天然的放射性元素一样。 |
| 9. | These skeletons are among the most radioactive ever found , on a par with those found at hiroshima and nagasaki
这些骸骨当中可以发现放射性元素，就像在广岛和长崎找到的一样。 |
| 10. | Inorganic chemicals ; organic or inorganic compounds of rare - earth metals , of radioactive elements or of isotopes
无机化学品；稀土金属，放射性元素及其同位素之有机及无机化合物 |
