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Reference.org
Project 4.1
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<p>Project 4.1 was the designation for a medical study and experimentation conducted by the United States of those residents of the <a href="/facts/Marshall_Islands/rRV4U7oD">Marshall Islands</a> exposed to <a href="/facts/Nuclear_fallout/I1kJkLKt">radioactive fallout</a> from the 1 March 1954 <i><a href="/facts/Castle_Bravo/R2F4BRFf">Castle Bravo</a></i> <a href="/facts/Nuclear_testing/s2srGDFP">nuclear test</a> at <a href="/facts/Bikini_Atoll/NrrgM5pd">Bikini Atoll</a>, which had an unexpectedly large <a href="/facts/Nuclear_weapons_yield/53of1vqQ">yield</a>. Government and mainstream historical sources point to the study being organized on March 6 or 7 March 1954, less than a week after the <i>Bravo</i> shot. </p>