Like Arnie Gunderson, Helen Caldicott (the lady in the video) is someone that knows what she's talking about and has the credentials to back it.
Quote from wiki article:
http://en.wikipedia.org/wiki/Helen_CaldicottDuring her time in the United States from 1977 to 1986, Caldicott was the founding president from 1978 to 1983 of Physicians for Social Responsibility (founded originally in 1961 and dormant from 1970 to 1978), and she helped to recruit 23,000 doctors committed to educating the public and their colleagues on the dangers of nuclear energy. She also worked abroad to establish similar national groups that focused on education about the medical dangers of nuclear energy, nuclear weapons and nuclear war. The umbrella organisation International Physicians for the Prevention of Nuclear War) was awarded the Nobel Peace Prize in 1985. She herself received the Humanist of the Year award from the American Humanist Association in 1982.