In 1964, Gofman raised questions about a lack of data on low-level radiation and also proposed a wide-ranging study of exposure in medicine and the workplace at a symposium for nuclear scientists and engineers. This helped start a national inquiry into the safety of atomic power. With his colleague Dr. Arthur R. Tamplin, Dr. Gofman then looked at health studies of the survivors of Hiroshima and Nagasaki, as well as other epidemiological studies, and conducted research on radiations influences on human chromosomes. The two scientists suggested that federal safety guidelines for low-level exposures be reduced by 90 percent in 1969. The Atomic Energy Commission contested the findings, and "the furor made Dr. Gofman a reluctant figurehead of the anti-nuclear movement" according to The New York Times'.  In 1970, he testified in favor of a bill to ban commercial nuclear reactors in New York City and told the City Council that a reactor in an urban environment would be "equal in the opposite direction to all the medical advances put together in the last 25 years."