1.
Alpha particles emitted by radioactive nuclei have energies of a few Mev.
由放射性原子核发射出的α粒子能量一般为几个Mev。
2.
Radioactivity is the ejection of particles or radiation from the nucleus.
放射性是原子从核中射出粒子或辐射的现象。
3.
The time required for half the nuclei in a sample of a specific isotopic species to undergo radioactive decay.
半衰期放射性样品的原子核经历一半放射性衰变所需要的时间
4.
The radiation, including alpha particles, nucleons, electrons, and gamma rays, emitted by a radioactive substance.
辐射由一种放射性物质发出的辐射，包括α粒子、原子核、电子、和γ射线
5.
a clean nuclear bomb.
无放射性尘埃的原子弹
6.
alpha-emitting radionuclides
发射α粒子的放射性核素
7.
(the sending out of)rays and atomic particles from radioactive substances
（自放射性物质中放射出的）射线和原子粒子
8.
Nuclear explosions have released radiative particles into the sea.
核爆炸向海洋释放了放射性粒子。
9.
atomic radiation
原子放射，原子辐射
10.
Any of three processes of radioactive disintegration in which a Beta particle is spontaneously emitted by an unstable atomic nucleus in order to dissipate excess energy.
某些不稳定原子核为耗散其过剩能量而自发发射一个β粒子的三种放射性衰变过程的统称。
11.
Type of radioactive disintegration (see radioactivity) in which some unstable atomic nuclei dissipate excess energy by spontaneously ejecting an alpha particle.
放射性蜕变的一类,某些不稳定原子核自发射出一个α粒子以耗散过剩能量。
12.
Severe overheating of a nuclear reactor core, resulting in melting of the core and escape of radiation.
熔炉由熔解原子核及辐射的释放引起的原子核反应之极度过程
13.
giant particle (GP)
(核爆炸沉降物中)强放射 性粒子
14.
The intensity of a radioactive source.
放射性放射原的强度
15.
a radioactive isotope of strontium (with the mass number 90) that is present in the fallout from nuclear explosions; can be assimilated like calcium into bones.
锶的放射性同位素（原子质量数为），存在于核爆炸的原子尘中，能象钙一样被吸收到骨中。
16.
A nuclide that exhibits radioactivity.
放射性核素表现出放射性的核素
17.
radioactive decay with emission of carbon nuclei
碳核发射放射性衰变
18.
Radioactive series: Any of four sets of unstable heavy atomic nuclei that undergo a series of alpha decay and Beta decay until a stable nucleus is achieved.
放射性系:四组不稳定的重原子核,通过一系列α衰变和β衰变直至达到稳定的核为止。