| 1. | 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。 |
| 2. | 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。 |
| 3. | In the deep mantle the highest possible concentration of radioactive materials is limited by the condition demanding temperatures below the melting point .
在地幔深部，放射物质最高的可能浓度受溶点以下的温度条件所限制。 |
| 4. | Regulations for the safe transport of radioactive material
放射性物质安全运输规程 |
| 5. | General rules for sampling airborne radioactive materials
气载放射性物质取样一般规定 |
| 6. | Limited concentrations of radioactive materials in foods
食品中放射性物质限制浓度标准 |
| 7. | Examination of radioactive materials for foods - general principle
食品中放射性物质检验 |
| 8. | Particles , etc . emitted by radioactive materials as they
放出的粒子例如粒子及粒子等。 |
| 9. | Examination of radioactive materials for foods - general principle
食品中放射性物质检验总则 |
| 10. | General principles for sampling airborne radioactive materials
机载放射性物质取样的一般原则 |
