“A 10 KT bomb exploded at ground level in Greenwich Village in Manhattan is way, way too small to do much beyond about 2.5 km - and would produce about 103,000 deaths and about 213,000 injuries. “
This due to the blast itself.
How many would be exposed to radiation at levels causing radiation syndrome, which can cause death over a week or month time frame.
You might be surprised at how survivable the post bomb is. Fallout can be avoided. Radiation around the site would be bad, but the death toll would take years, not weeks.