How Deadly is Plutonium?

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Rarely is the word "plutonium" published in a major news source without the adjective "deadly" nearby. Ralph Nader, noted activist and lawyer, once claimed that plutonium was "the most toxic substance known to mankind."

Hundreds of millions of dollars are being spent each year in the United States doing studies of the characteristics of a site for long term geologic storage of spent nuclear fuel. Much of the money is aimed at ensuring that no material ever gets out of the storage area. The material that seems to cause the most concern is the small amount of plutonium found in the irradiated fuel assemblies.

Some pundits have suggested that plutonium, even in quantities far too small for a nuclear weapon, could be used as a terrorist weapon to poison water supplies. It is said that such a use could cause thousands of deaths.

Mr. Nader refused the challenge. Many anti-nuclear groups now try to claim that Dr. Cohen is an unreliable source of information since he volunteered to expose himself to such a dangerous substance.

Dr. Cohen, a tenured research professor at the University of Pittsburgh, stated that he had calculated his risk from the challenge as less than that of a typical draftee during World War II. Dr. Cohen feels that wise use of nuclear energy is as important as winning the war. He wanted to do his part in the battle to achieve public acceptance of the low level risk involved.

An indication of the risk one would face from ingesting small amounts of plutonium, of the amounts postulated for accident scenarios at an operating plant (or fuel storage facility) is shown by the following story.

The sample size is quite small; even during a crash wartime program, people normally handle plutonium with extreme care. Even people who work directly with the material in a manufacturing process that involves grinding and shaping can be adequately protected.

It is, of course, possible that the differences between expected deaths and actual deaths is just a statistical aberration. With small sample sizes, it is likely that large variations in mortality rate will be seen.

It has to be considered important, however, to know that at least 22 men have been able to live more than 40 years after ingesting "the most toxic substance known to man." It should make one question the motives and accuracy of Ralph Nader, a public figure who has actively promoted such an obviously inaccurate statement.

One final thought. Glen Seaborg, Nobel Laurate, discoverer of plutonium, a man who spent much of his professional life determining its chemical properties, has recently been selected the honorary chair of the American Nuclear Society Special Panel on the Protection and Management of Plutonium. Dr. Seaborg is 83 years old and he still maintains an active schedule of committees and speaking.