阿尔法粒子是氦核，它们是放射性衰变的产物。
Alpha particles are these helium nuclei, and they are the result of radioactive decay.
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。
As radon progeny decay, they emit radioactive alpha particles and attach to aerosols, dust and other particles in the air.
粒子是从天然放射性蜕变得到的带正电的氦核。
Alpha particles are positively charged helium nuclei obtained from natural radioactive decay.
在一个实施方式中，近距离放射治疗植入粒子包括其内容纳有放射性核的密封无机金属圆筒。
In one implementation, a brachytherapy implant seed includes a sealed inorganic metallic cylinder having a radioactive core received therein.
在一个实施方式中，近距离放射治疗植入粒子包括其内容纳有放射性核的密封无机金属圆筒。
In one implementation, a brachytherapy implant seed includes a sealed inorganic metallic cylinder having a radioactive core received therein.
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