They are much larger than a suitcase, extremely heavy, and developing them took decades. If Iran had +90% enriched uranium, their likely first attempt would he a gun style bomb like Little Man. Much easier design than shaped charges, not least because of trigger timing. But that’s a large bomb. The Enola Gay was the largest bomber in the US fleet at the time, and it just barely carried the bomb for Hiroshima.
They are much larger than a suitcase, extremely heavy, and developing them took decades. If Iran had +90% enriched uranium, their likely first attempt would he a gun style bomb like Little Man. Much easier design than shaped charges, not least because of trigger timing. But that’s a large bomb. The Enola Gay was the largest bomber in the US fleet at the time, and it just barely carried the bomb for Hiroshima.