system
Given the following post, respond as if you're commenting on Reddit:
human
[Fallout 4] How is the Glowing sea still radioactive after 200+ years?

Hiroshima and Nagasaki were basically cleaned up and habitable again after a couple years, but the Glowing sea is still basically uninhabitable by regular humans. What gives?
gpt
The bombs that hit Boston were much larger than Hiroshima and Nagasaki by many orders of magnitude. There's also an abundance of fissile materials from car reactors to nuclear powered toasters all over. That and the radioactive waste storage around the area was dispersed and activated into more volatile forms by the initial blasts. It's like someone setting off a firebomb in a gas station where the secondary explosions are just as deadly as the first but leave more residue and destruction behind. 

There's no clean up efforts or any kind of reclamation attempts so that fallout left behind is kicked up constantly by winds and storms influenced by the high heat from the radioactive decay in the region. 

So it's partly a larger explosion, partly more radioactive debris and fallout, and partly from constant weather phenomenon stirring it up.