The only reason a country clandestinely enriches uranium to 20% is to preload the enrichment to bomb grade material soon after. Israel was wrong to chicken out. At this point you accept Iran "has the bomb" or you graphite the fuck out of its power grid. https://twitter.com/disclosetv/status/1346114474353319939 …
Uranium based bombs are bulky, BUT they give off almost no radiation. Shipping them to terrorists would be super simple. They are invisible from space or from airborne detection. A truck, a boat, a terror tunnel? You'd want a uranium bomb. A missile? A jet, you want plutonium