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~(228)Ra从钍工业放射性废料中作为一种付产品而获得。在印度的钍工厂生产中每日最多可回收250毫居里。~(228)Ra是钍放射系(A=4n)的第一个子
~ (228) Ra is obtained as a by-product from thorium industrial radioactive waste. Up to 250 milliliters can be recovered daily in the production of thorium in India. ~ (228) Ra is the first subset of thorium emission (A = 4n)