National Geographic did a detailed, like 15 page article on dirty bombs years ago. It showed calculated blast radii of different kinds of bombs of diverse types. Conventional, radiological, fission, and fission-fusion. They all look bad, but only the conventionals were constrained in any way. We can’t control the wind (intentionally) yet, but we can throw enough radioactive material into the air to kill a lot of people, and cause birth defects and stillbirths and raise cancer risk for those who survive that for a pittance in both effort and monetary cost, and it can last generations.
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