Ephraim Fischbach, a physics professor at Purdue, was looking into the rate of radioactive decay of several isotopes as a possible source of random numbers generated without any human input.

普渡大学物理教授Ephraim Fischbach，将探测几种同位素的放射性衰变速率的方法作为一种没有人为输入因素干扰的产生随机数的可能方法。

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Unbeknown to them, the "scrap" contained a highly radioactive source used to treat cancer patients.

他们不知道这件“废品”里有一个用于治疗癌症患者的高辐射源。

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Any missions hoping to go farther will need a means of acceleration that can get the spacecraft to the edge of explored space faster—before it has depleted its radioactive power source.

故而，任何更深空的宇宙探索都需要寻找技术途径来加速航天器，以便在放射性能源耗尽之前到达星系边缘。

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Extensive work is under way to determine the source of radioactive particles at a Fife beach.

BBC: Dalgety Bay radiation: Diggers to be used in pit testing

Further work to determine the source of radioactive particles at a Fife beach will begin next week.

BBC: Dalgety Bay radiation: Tests to begin at beach next week

Tokyo Electric has been using colored powder to trace the source of highly radioactive water leaking into the ocean near Fukushima, which was damaged by an earthquake and tsunami last month.

FORBES: On Japan: Russia Sends Help, China Finds Radiation and India Bans Rice