| 1. | Because of this radiation they said the substance was radioactive .
由于这种辐射性现象，他们把该种物质称为放射性物质。 |
| 2. | The transmutation of the elements was no longer the privilege of the radioactive substances alone .
元素的衍变不再是放射性物质独具的特点。 |
| 3. | Since the pioneer days of the curies, many more radioactive substances have been discovered .
自居里夫妇的开创性时代以来，已经发现许多其他放射性物质。 |
| 4. | The closed system of bomb plus water bath has a constant volume and is thermally insulated .
放射性物质容器弹和水槽组成的封闭体系具有恒定体积，而且是绝热的。 |
| 5. | A radioactive particle moving in a blood stream causes transient changes of dose rate near its path .
当一个放射性物质在血流中移动时在它的路径附近引起剂量率的瞬间变化。 |
| 6. | Because of the continuous decay, the quantity of radioactive material and the rate of emission of radiation decrease steadily .
由于连续衰变的结果，放射性物质的数量，辐射发射率都逐渐下降。 |
| 7. | A person handling radioactive materials has no way of telling whether he is touching something too "hot" for safety .
一个处理放射性物质的人却无法断定他是否正在接触某种太“热”的危及安全的东西。 |
| 8. | Application for a permit to move radioactive substances
申请搬运放射性物质许可证 |
| 9. | Regulations for the safe transport of radioactive material
放射性物质安全运输规程 |
| 10. | Forms - radioactive substances and irradiating apparatus
表格-放射性物质及辐照仪器 |
