| 1. | Overburden had concealed the radioactivity .
覆盖层屏蔽掉了放射性。 |
| 2. | All living things contain radiocarbon .
所有生物都含有放射性碳。 |
| 3. | The fission products formed are highly radioactive .
所生成的裂变产物具有很强的放射性。 |
| 4. | We should stop talking about the menace of fallout .
我们不应再谈论关于放射性微尘的危害。 |
| 5. | The material in this beach has been dated by radiocarbon .
这个海滩上的物质经过放射性碳测定。 |
| 6. | The surveyed grids were also used for radiometric probing .
该方格网还用来进行放射性浅孔测量。 |
| 7. | Nuclear explosions have released radiative particles into the sea .
核爆炸向海洋释放了放射性粒子。 |
| 8. | Natural radioactivity contains a store of valuable information .
天然放射性包含着许多有价值的信息。 |
| 9. | When the organism dies, no new radioactive carbon is assimilated .
机体死后，不能再吸取新的放射性碳。 |
| 10. | Radioactivity is found on both sides of the failure plane in all cases .
破断面的任何一侧都发现有放射性。 |
