1.
It had been used for practical ends, to identify elements and to unravel radioactive decay chains.
已将其用于实践的目的，去鉴别元素和阐明放射性衰变系。
2.
radioactive decay with emission of carbon nuclei
碳核发射放射性衰变
3.
beta-plus decay radioisotope
正β衰变放射性同位素
4.
decay radioisotope
β衰变放射性同位素 β
5.
beta-minus decay radioisotope
负β衰变放射性同位素
6.
radioactive recoi
放射性衰变引起的反冲
7.
To disintegrate or diminish by radioactive decay.
衰变由于放射性衰变而解体或缩小
8.
radiation resulting from radioactive decay.
由放射性衰变产生的辐射。
9.
the radiation of alpha particles during radioactive decay.
在放射性衰变的过程中放出α粒子的辐射。
10.
radiation of beta particles during radioactive decay.
在放射性衰变的过程中放出β粒子的辐射。
11.
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
12.
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。
13.
electromagnetic radiation emitted during radioactive decay and having an extremely short wavelength.
辐射性衰变放出的电磁射线，波长非常短。
14.
The radioactive transformation giving rise to these electrons was known as beta decay.
产生这种电子的放射性变化，称为β衰变。
15.
any of several radioactive gases that are isotopes of radon and are products of radioactive decay.
"几种氡的同位素的放射性气体,是放射性物质衰变的产物."
16.
a unit strength of a radioactive source equal to one million disintegrations per second.
放射性强度单位等于每秒百万次数衰变。
17.
The breakdown of radioactive isotopes goes on at constant rates.
放射性同位素的衰变在恒定的速率下进行。
18.
Unlike helium-4, it cannot be produced by radioactive decay.
与氦－4不同之处是，氦－3不能由放射性衰变产生。