他们辩解说，由这次试验所造成的大气层放射活动的增加是微不足道的。
They argued that only a negligible rise in atmosphere radioactivity resulted from the test.
我亲自组织了反对在大西洋倾倒放射性废料的示威活动。
I personally arranged for the demonstration against radioactive waste dumping in the Atlantic Ocean.
在最近一次参观田纳西州查塔努加市厄兰格癌症中心的活动中，约有十二名6 - 12岁的儿童进入了灌注放射化疗室。
During a recent session at the Erlanger Cancer Center in Chattanooga, Tennessee, about a dozen children ages six to 12 toured the chemotherapy infusion and radiation rooms.
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