radioactive dust

1. External irradiation is produced when a person is exposed to external sources such as X-rays or when radioactive material ( e.g. dust, liquid, aerosols) becomes attached to skin or clothes, resulting in external contamination.
   当一个人暴露在外来辐射源如X光下，或者当皮肤接触到放射性物质（如灰尘，液体，气雾剂）时，外部照射就产生了，其结果是外部污染。
2. The radioactive dust will contribute to higher levels of uranium and radon.
   放射性尘埃会形成铀和氡的高值。
3. The same radioactive dust from the Chernobyl incident.
   与切尔诺贝利事件能产生的放射污染一样严重。
4. As radon progeny decay, they emit radioactive alpha particles and attach to aerosols, dust and other particles in the air.
   氡子核在衰变时发射出放射性阿尔法粒子，这些粒子可附着于空气中的浮质、灰尘及其它粒子。
5. Radioactive fall-out ( dust carried by winds around the earth after a nuclear explosion, etc)
   放射性微粒回降（核爆炸等之后放射性尘埃随风散落到地面）
6. The US official said the likelihood of the above scenario is based on the assumption that the number of nuclear weapons on each side matches the number of their targets while all weapons are successfully launched, resulting in surface explosions and dispersion of radioactive dust clouds.
   这位美国官员说，这种情形的发生是假设每一方可能拥有的核武数量与它们的攻击目标相符，同时所有武器都成功发射，在地面爆炸，散发出辐射尘云。
7. Filter, air, specially designed to eliminate radioactive dust
   清除放射性尘埃专用空气过滤器
8. Research and test for depressing radioactive dust and radon daughters and radioactive aerosols in situ with the technique of supervoltage static electricity
   应用超高压静电就地抑制放射性粉尘、氡子体与放射性气溶胶的试验研究
9. The main factors of radiation hazards in uranium mines are radioactive dust, radon and its daughters.
   铀矿山的主要辐射危害因素是放射性粉尘、氡气及其子体。
10. The main radioactive contaminants in uranium mines are radon and its daughters, while in uranium plants the dust produced in crushing operation is the main source of contamination.
    铀矿山和铀工厂既存在普通矿冶工业的危害，又存在放射性危害，如放射性矿尘、氡和氡子体、γ外照射以及表面放射性沾污等。

noun

1. the radioactive particles that settle to the ground after a nuclear explosion

   Synonym:    fallout