By 1902, the Curies had extracted a tenth of a gram of pure radium chloride salt from several tons of pitchblende, an incredible feat at the time.

到 1902 年，居里夫妇从几吨沥青铀矿中提取了十分之一克的纯氯化镭盐，这在当时是一项了不起的壮举。