The first type discovered -- alpha decay -- is when a radioactive particle emits a Helium nucleus !

我们发现的第一种衰变方式——阿尔法衰变——是放射性粒子产生氦分子！

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A radioactive particle moving in a blood stream causes transient changes of dose rate near its path.

当一个放射性物质在血流中移动时在它的路径附近引起剂量率的瞬间变化。

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Conclusion the radioactive particle implantation in tumor brachytherapy is a new, effective and minimally invasive therapy.

结论放射性粒子近距离治疗各种肿瘤效果明显，为一种新的微创治疗肿瘤的手段。

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In June scientists revealed a "significantly radioactive" particle had been found outside the cordoned-off area in which more than 2, 000 radioactive objects and particles have been unearthed since October 2011.

BBC: Dalgety Bay radiation: Diggers to be used in pit testing

Radioactive decay happens when a radioactive substance emits a particle.

FORBES: Radioactive Decay Rates May Not Be Constant After All

It is unclear how solar particles affect rates of radioactive decay, but Prof Jenkins asserts that "either neutrinos are affecting the decay rate or perhaps an unknown particle is".

BBC: System could warn of solar storms