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Science 26 September 1997:
Vol. 277. no. 5334, p. 1920
DOI: 10.1126/science.277.5334.1920a
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RADIATION POISONING:
NIH Case Ends With Mysteries Unsolved

Jocelyn Kaiser

In June 1995, a pregnant scientist in a lab at the National Institutes of Health (NIH) said she had been poisoned by a radioactive isotope, and 26 of her co-workers were subsequently found to have been contaminated as well. Last week, an investigation into this bizarre affair drew to a close, leaving many questions unanswered. In a decision issued on 17 September, the Nuclear Regulatory Commission concluded that the radiation exposure of the scientist, Maryann Wenli Ma, and others was "deliberate." But it could not identify the perpetrator and offered no motive.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)