[PIF]

Destruction and radius depends on the yield of the particular devise, and on how well it was maintained prior to use - you just do not pick one up and put it into the closet until you want to use it.

Figure if it is a fission devise that all dead within 1 mile at the minimum.

Here you go make your own local nuke explosion:
NUKEMAP

[Pollster1]

Figure if it is a fission devise that all dead within 1 mile at the minimum.

Even that would be an accomplishment for an improvised or low-tech device. Unless they have connections in high places within a sophisticated nuclear country . . .

. . . fission yields would be quite limited, and there would be survivors within a mile of ground zero. Akiko Takakura survived at three hundred meters from ground zero in Hiroshima, and Tsutomu Yamaguchi survived both Hiroshima and Nagasaki within 3 km from ground zero both times (either very lucky to survive or very unlucky to be visiting Hiroshima on the wrong day and then back at his job in Nagasaki, despite his burns, later that week).

Add tritium - correctly - and all bets are off. But where would they get the detailed technical knowledge; theory is not enough. It's not like high government officials in the United States government would mishandle Top Secret . . . um . . . never mind.