text: According to the Final Project 4.1 report, the Bravo test exposed 239 Marshallese on the Utirik, Rongelap, and Ailinginae Atolls to significant level of radiation, and 28 Americans stationed on the Rongerik Atoll were also exposed. Those on the Rongelap Atoll were the most seriously affected, receiving approximately 175 rads of radiation before they were evacuated. Those on Ailinginae received 69 rads, those on Utirik received 14 rads, and the Americans on Rongerik received an average dose of 78 rads.
  The results of the original Project 4.1 were published by the study's authors in professional medical journals in 1955, such as the Journal of the American Medical Association.
  In 2010 it was calculated that by sub-population, the projected proportion of cancers attributable to radiation from fallout from all nuclear tests conducted in the Marshall Islands is 55% (with a 28% to 69% uncertainty range) among 82 persons exposed in 1954 on Rongelap Atoll and Ailinginae Atoll.
  Most of the individuals exposed did not immediately show signs of radiation sickness, though within a few days other effects of significant radiation exposure manifested: loss of hair and significant skin damage, including "raw, weeping lesions", among the Rongelap and Ailinginae groups. The lesions healed quickly, however, consistent with radiation exposure. The report abstract concluded that "estimates of total body burden indicate that there is no long term hazard."
  Additional follow-up checks on the Marshallese studied in Project 4.1 were conducted at regular intervals afterwards every year since 1954. Though the Marshallese experienced far milder immediate effects than the Japanese fishermen exposed to Bravo fallout on the fishing boat Daigo Fukuryū Maru, the long-term effects were more pronounced as they depended largely on subsistence living and were relocated to the site of the testing in Bikini, Ene Wetak, and Rongelap while the Japanese fisherman were returned to Japan. For the first decade after the test, the effects were ambiguous and statistically difficult to correlate to radiation exposure: miscarriages and stillbirths among exposed Rongelap women doubled in the first five years after the accident, but then returned to normal; some developmental difficulties and impaired growth appeared in children, but in no clear-cut pattern. In the decades that followed, though, the effects were undeniable. Children began to disproportionately develop thyroid cancer (due to exposure to radioiodines), and almost a third of those exposed developed neoplasms by 1974.