The paper, though it promises a firm result, isn’t that clear. For fertilizer grade Ammonium Nitrate, between 3 and 14 percent equivalent TNT. Technical grade Ammonium Nitrate is more explosive (10-32 percent equivalent). I suppose that if one were experienced at this sort of thing, one could estimate overpresssure at various radii from what’s known from building damage, and obtain an equivalence from there.
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