Leave a poster or a book cover in a sun-facing window for a year. I’ll wait.
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Okay, you should be back by now. You might have noticed that it’s more faded now than a year ago. That’s because the sun’s radiation caused the pigments to break down. A nuclear bomb also produces a lot of radiation, all at once. Whatever was close to the explosion received more radiation flux in that brief moment than whatever you put in your window did over the entire year.
A human body is enough to block sufficient radiation that spots where people were between the blast and the object were less bleached than the areas that were hit directly. A lot of radiation still passed through the people (doing horrible damage to their cells while doing so) and into what was behind them, but the difference was enough that it would be easily visible.
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