In the wake of the film (which I won't watch until it's available online), here's a New Yorker piece with some nice detail on the test.
snip
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The nearest town of more than fifty people was fewer than thirty miles away, and the nearest occupied ranch was only twelve miles away—long distances for a person, but not for light or a radioactive cloud. (One of Trinity’s more unusual financial appropriations, later on, was for the acquisition of several dozen head of cattle that had had their hair discolored by the explosion.) The Army made preparations to impose martial law after the test if necessary, keeping a military force of a hundred and sixty men on hand to manage any evacuations. Photographic film, sensitive to radioactivity, was stowed in nearby towns, to provide “medical legal” evidence of contamination in the future. Seismographs in Tucson, Denver, and Chihuahua, Mexico, would reveal how far away the explosion could be detected.
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And Sukie notes this on the sourcing of Uranium for the project.
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