| 1. | Evaluation of natural radioactivity level in environment near a urarium mine
某天然铀矿附近环境放射性水平与评价 |
| 2. | Natural uranium is composed of 3
天然铀由三个 |
| 3. | The basic fuel for nuclear reaction is derived from natural uranium , a very heavy metal
核反应堆的基本燃料取自天然铀，铀是一种非常重的金属。 |
| 4. | The basic fuel for nuclear reaction is derived from natural uranium , a very heavy metal
核反应堆的基本燃料取自天然铀，铀是一种非常重的金属。 |
| 5. | Candu is a pressurised heavy water reactor operated on natural uranium fuel u - 238 and uses heavy water d
Candu是重水压水式反应堆的一种，以天然铀燃料u - 238运作，并以重水d |
| 6. | Nuclear criticality safety for fissile materials outside reactors - nuclear criticality control criteria and subcritical limits for plutonium - natural uranium mixtures
反应堆外易裂变材料的核临界安全钚-天然铀混合物的核临界控制准则和次临界限值 |
| 7. | If using the natural uranium to replace the heu pit in warhead , the delayed neutron counting rate would be about 3 times lower . the coincidence neutron detection is proposed to be used in nuclear warhead detection
计算表明用天然铀替代高浓铀作的假弹头，它们的出壳缓发中子数相差约3倍，需在一定条件下，才可对真伪核弹头做出判断。 |
| 8. | The results show that coincidence detection method has obvious benefit in detecting nuclear warheads . for the same type warhead , the coincidence counts rates of the model of warhead of heu pit is 10 times as big as that of fake warhead of natural uranium pit . if we know the nuclear warheads configuration by other methods , the method of coincidence neutron detection could be used to distinguis h the fake nuclear warheads from the reals
计算表明用探测符合中子的方法探测核弹头对区分真假核弹头有明显的优点，对于同一核弹头模型，裂变弹芯是高浓铀和用天然铀替代高浓铀时，符合中子计数相差1个量级，如通过其他途径了解核弹头的大致结构，符合测量的方法就可以有较高的置信度分辨真假核弹头。 |
