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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In addition to the reactor cores, the storage pool for highly radioactive irradiated nuclear fuel is also at risk.

除了反应堆堆芯，用来储存辐射性极强的辐照核燃料的贮存池也很危险。

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But roughly 5 percent of reactor waste is highly radioactive fission products, including plutonium and other actinides.

但是约有百分之五的反应堆废料是高放射性裂变产物，包括钚和其他锕系元素。

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It was an attempt to cool the highly radioactive fuel rods from overheating.

VOA: special.2011.03.19

Given enough resources, Lochbaum explained, even a highly radioactive site can be decontaminated so that people who were evacuated can move back.

FORBES: Fukushima and Chernobyl, similar but different

An alarm at reactor number three earlier revealed the system had stopped at one of the pools containing spent, but highly radioactive, fuel rods.

BBC: Fukushima nuclear plant: Cooling system power restored

The researchers fired a beam of calcium ions, each containing 20 protons, into a target of californium, a highly radioactive synthetic substance with 98 protons.

ECONOMIST: Nuclear physics: Magical shell game | The