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alfa zračenje Tok alfa čestica što ih izbacuju mnogo radioaktivne tvari imaju snagu prodiranja par cm u zrak, ali se mogu zaustaviti tankim komadom papira
environ.	阿尔法射线 (许多放射性物质发射出的、能穿透几厘米的空气但会被一张薄纸挡住的阿尔法粒子流。)