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原子 = atom; 原子核 = (a)
质子 = proton; 中子 = (a)
质子与中子(protons & neutrons)统称为核子 = (a) s
核素标记法 = (a) notation
离子化/电离 = ___ise / ___ize (a)
穿透力 = (a) power
α 阿尔法衰变 = (a) decay
β 贝塔粒子 = (a) particles
γ 伽马射线 = (a) rays
半衰期 = ____-____ (a)
盖格计数器 = (a) counter
背景辐射 = (a) radiation
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