α铁
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alpha iron 铁
alpha iron alloy 铁基合金
N a magnetic allotrope of iron that is stable below 910°C; ferrite 阿尔法铁素体
If he switched from gold to let's say iron, he also tried platinum, a number of different foils, he found that they count rate it still was 20 alpha particles per minute.
金箔的时候，计数率就变成零了，如果他把金换成比如说铁，他们还尝试了铂，还有一系列其他的箔片，他发现计数率还是每分钟。
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