Particles,Alpha
《英文msh詞典》Particles,Alpha
[入口詞] Particles,Alpha
[主題詞] Alpha Particles
[英文釋義] Positively charged particles composed of two protons and two neutrons,i.e.,helium nuclei,emitted during disintegration of very heavy isotopes; a beam of alpha particles or an alpha ray has very strong ionizing power,but weak penetrability.