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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from U. S. Project Trinity Report by Carl Maag and Steve Rohrer: distance. This group made several sampling excursions on 16 and 17
July. The tank carried two personnel (a driver and a passenger) each
trip. No member of this party received a radiation exposure of more
than 1 roentgen (1).
Five other men from the earth-sampling group entered the ground zero
area in a second tank, lined with lead for radiation protection. The
tank, carrying the driver and one passenger, made five trips into the
ground zero area to retrieve soil samples on 16 and 17 July. On two
trips, the tank passed over ground zero; on the others, it approached
to within about 90 meters of ground zero. The men scooped up soil
samples through a trap door in the bottom of the tank. One driver who
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