the events at chernobyl are different to a nuclear bomb - chernobyl was a nuclear fueled fire which burnt for days , a bomb goes bang , and its job is done ; there were radioactive elements at chernobyl which won`t be seen in a bomb blast, also chernobyl had days to poison the land a bomb blast is over quickly , and whislt there is radioactivity , you can begin a clean up in a relatively short time afterwards.