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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: registered. On 1 September, the mounted patrol moved to a distance of
460 meters from ground zero, just outside a fence installed a week
earlier to seal off the area. The same rotating patrol schedule was
used. The guards' film badge readings showed an average daily
exposure of 0.02 roentgens. The mounted patrol at the fence continued
until early 1947 (1).
Between 20 July 1945 and 21 November 1945, 67 groups entered the
ground zero area. Most of these parties entered in the month after
shot-day. These were the scientists and technicians conducting
experiments or retrieving data. By the beginning of September, most
of those who entered the ground zero area were invited guests (1).
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