Early activity Caldicott's interest in nuclear issues was sparked when she read the 1957
Nevil Shute book
On the Beach, a novel about a
nuclear holocaust set in Australia. In the 1970s, she gained prominence in Australia, New Zealand and North America, speaking on the health hazards of radiation from the perspective of paediatrics. Her early achievements included convincing Australia to sue France over
its atmospheric testing of nuclear weapons in the Pacific in 1971 and 1972, which brought the practice to an end. She also informed Australian trade unions about the medical and military dangers of uranium mining, which led to the three-year banning of the mining and export of uranium. After visiting the Soviet Union in 1979 with an AFSC delegation and upon learning the impending US deployment of cruise missiles (which would end arms control) and Pershing II missiles that could hit Moscow from Europe in 3 minutes, Caldicott left her medical career to concentrate on calling the world's attention to what she referred to as the "insanity" of the
nuclear arms race and the growing reliance on
nuclear power. In 1978 she reinvigorated
Physicians for Social Responsibility. Over time she and others recruited 23,000 physicians to this organisation which, through wide educational efforts, taught the US public about the dire medical implications of both nuclear power and nuclear war. In 1985 this national organisation and many others, she founded around the world were awarded the 1985
Nobel Peace Prize. She was herself nominated for the Nobel Prize by Linus Pauling, himself a Nobel winner. In 1989, Caldicott was interviewed by
Caroline Jones on her
Radio National program,
The Search for Meaning. Caldicott stood as an independent candidate for the Australian House of Representatives at the
1990 federal election, contesting the
Division of Richmond, against the Leader of the
National Party,
Charles Blunt. She polled 23.3% of the votes; not enough to win, but her preferences went mostly to the
Labor candidate,
Neville Newell, electing him and unseating Blunt. In 2002 Caldicott released
The New Nuclear Danger, a commentary on the George Bush
military-industrial complex. The book was reviewed by
Ivan Eland of
The Independent Institute. He wrote, "She makes many cogent criticisms about current and prior administrations’ nuclear policies and the excesses of the government-dominated military-industrial complex associated with nuclear weapons, but her often valid points are undermined by other far-fetched or alarmist arguments, sloppy research, and haphazard footnoting." In 2008 Caldicott founded the Helen Caldicott Foundation for a Nuclear Free Future which, for over four years, produced a weekly radio commentary, "If You Love This Planet". In April 2011, Caldicott was involved in a public argument in
The Guardian with British journalist
George Monbiot. Monbiot expressed great concern at what he saw as a failure by Caldicott to provide adequate justification for any of her arguments. Regarding Caldicott's book
Nuclear Power is Not The Answer, he wrote: "The scarcity of references to scientific papers and the abundance of unsourced claims it contains amaze me." Caldicott claimed, "As we have seen, he and other nuclear industry apologists sow confusion about radiation risks and, in my view, in much the same way that the tobacco industry did in previous decades about the risks of smoking." Also in 2011, Caldicott made a written submission regarding the
Darlington Nuclear Generating Station new build project in
Canada in which she asserts that
plutonium can cause cancer of the testicles after accumulation in these organs. In 2014,
Physicians for Social Responsibility hosted a lecture on "Fukushima's Ongoing Impact" by Caldicott in Seattle, Washington. ==Honours and awards==