While the outcome of the many lawsuits filed against the government and associated bodies suggests a clear cut moral high-grounded concerning these experiments, there are a number of considerations that must be taken into account. The first, and most popular, is whether it is fair to judge the morality of these human experiments through the lens of modern bioethics. While it's often argued that The Nuremberg Code published in 1949 provided clear-cut guidelines as to what was and was not acceptable with regard to human experimentation, and it is undeniably true that many of the experiments whose timeline coincided or surpassed the release of this Code explicitly violated its terms, this argument fails to take into account the tension and temperament of a wartime experience.  Were these experiments performed with a greater good in mind? Morality is easily judged in hindsight. Additionally, while some of these experiments exposed patients to high levels of radiations, many experiments stayed within what was considered to be "safe" levels and among those that did, there is the lingering question - where these practicing in keeping with standard medical procedures of the day? With regard to a few of the cancer patients treated at the Oak Ridge Laboratory in Tennessee, consultations with leading physicians of the time period suggested that while some of the treatment decisions were sometimes odd, they were not necessarily inconsistent with the medical practices of the era. 
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Due to the multi-generational timespan and sheer scope of the human experimentation sponsored by the government throughout this era, only a subset of them will be addressed here. Following WWII, the recipients of government-sponsored radioactive experimentation was geographically far-reaching and demographically varied. In Tennessee, at the prestigious Vanderbilt University, hundreds of pregnant women were fed mildly radioactive iron at the university's free clinic.  Elsewhere in Tennessee, at the Oak Ridge Laboratories, cancer patients of varying ages were subject to whole-body irradiation. In Massachusetts, under the supervision of the Massachusetts Institute of Technology (MIT), mentally-challenged students at the local state school were encouraged to consume food and snacks laced with trace amounts of radioactive iron and calcium. In New York, at Columbia University and Montefiore Hospital, terminally-ill cancer patients were injected with radioactive calcium and strontium. Finally, all across the country, from New York to Chicago to California, patients at highly-regarded hospitals were administered injections of plutonium. 
Classified information in the United States - Wikipedia
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On November 15, 1993, journalist Eileen Welsome of The Albuquerque Tribune published "The Plutonium Experiment" describing how the United States Government had injected radioactive plutonium into unconsenting patients and listing five of those patient by name.  While the existence of these experiments had been reported on years prior, never before had a journalist uncovered the names of the people affected. In response to the media storm which followed Welsome's article, then Secretary of Energy Hazel O'Leary vowed to make public whatever documents she could, thus beginning the tedious process of declassifying confidential documents within the Department of Defense and the Department of Energy.