Yet so radioactive were her nerves, so adventurous her trust in rather vaguely conceived sweetness and light, that she was more energetic than any of the hulking young women who, with calves bulging in heavy-ribbed woolen stockings beneath decorous blue serge bloomers, thuddingly galloped across the floor of the "gym" in practise for the Blodgett Ladies’ Basket-Ball Team.
There are no more uses of "radioactivity" in the book.
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The half-life of highly radioactive substances is shorter than that of substances that radiate weakly.
For a while, people worried that the radioactive cloud could spread to Shogahama — or beyond.
Lauren Tarshis -- I Survived: The Japanese Tsunami, 2011