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！

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。

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。

Methods Respective summarized the operative matching points of 50 patients with maxillofacial malignant tumor when cured by radioactive particle implantation.

方法回顾分析50例颌面部恶性肿瘤患者放射性粒子组织间植入治疗的护理配合要点。

Objective in the accident conditions, the radioactive particle size and diffusion characteristics and its inhalation risk of plutonium dioxide were further investigated.

目的进一步研究在事故状态下，氧化钚放射性微粒的扩散特征和粒度特征及其吸入危险性。