dirty bombs, as in the non-nuclear form, is simple: you take any type of potently radioactive material and some explosives, like C-4, and load them into a bookbag, a truck, anything, then go VERY far away and denote the explosives. the blast wave propels the radioactive material in a large dust cloud, and the dirty bomb has done its toll.
A dirty nuclear bomb is detonated by using a conventional explosive. It disperses a large amount of nuclear material across the area.
The first atomic bomb detonated was not dropped, it was hung from the top of a steel structure and detonated remotely.
It is not , if it is not detonated and it is properly maintained.
USSR
The atomic bomb was detonated about 1,900 feet (580 meters) above Hiroshima.
The first atomic bomb was detonated on July 16, 1945, during the Trinity test in New Mexico as part of the Manhattan Project.
I assume you mean "Soviet bomb" - The Tsar Bomba (Царь-бомба) was detonated on October 30, 1961, in the Novaya Zemlya archipelago. It was the largest, most powerful nuclear weapon ever detonated.
The Tsar Bomba, the largest nuclear bomb ever detonated, was tested by the Soviet Union on October 30, 1961. It had a yield of approximately 50 megatons and was detonated above the Arctic Circle.
It was dropped over Hiroshima.
The 50 Megaton "Tsar Bomba" hydrogen bomb tested by the USSR in 1961 is the strongest hydrogen bomb ever detonated. The 10 Megaton "Ivy Mike" hydrogen bomb tested by the U.S. in 1952 is the physically largest hydrogen bomb ever detonated.
The biggest nuclear bomb ever detonated is called the Tsar Bomba. It was detonated by the Soviet Union in 1961 and had a yield of 50 megatons, making it the most powerful nuclear weapon ever tested.
The detonation of the bomb seemed fast approaching and inevitable.