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.
Unbeknown to them, the "scrap" contained a highly radioactivesource 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。
3
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.