The video explains that if foot soldiers traversed the ground zero area of a 10 kt high neutron flux weapon detonated at 500 ft, they would absorb 200 rads at H+1 hr.
If the crossing were delayed to H+10 hrs this dose would be reduced to 40 rads"
Aluminum pig pens with the Franklin shot tower in background.
Franklin's low yield caused the experiment to be redone on the Wilson Shot.