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Danger From Depleted Uranium Is Found Low In Pentagon Study
New York Times
October 19, 2004
Danger From Depleted Uranium Is Found Low In Pentagon Study
By Matthew L. Wald
WASHINGTON, Oct. 18 - A Pentagon-sponsored study of weapons made from
depleted uranium, a substance whose use has attracted environmental protests
around the world, has concluded that it is neither toxic enough nor
radioactive enough to be a health threat to soldiers in the doses they are
likely to receive.
In a five-year, $6 million study, researchers fired depleted uranium
projectiles into Bradley fighting vehicles and Abrams tanks, in a steel
chamber at the Aberdeen Proving Grounds in Maryland, and measured the levels
of uranium in the air and how quickly the particles settled.
The conclusion, said Dr. Michael E. Kilpatrick, deputy director of the
Deployment Health Support Directorate of the Defense Department, is that
"this is a lethal but safe weapons system."
The new study did not seek to measure how depleted uranium traveled through
the environment or its potential for entering drinking water or crops.
But it did measure how quickly uranium that is inhaled was passed through
the body. Lt. Col. Mark A. Melanson, the program manager for health physics
at the Army Center for Health Promotion and Preventive Medicine, said that
the aerosolized particles of depleted uranium were "moderately soluble," and
that inhaled particles would dissolve in lung fluids and eventually pass
through the kidneys and enter the urine, with half the uranium being
excreted in 10 to 100 days. Uranium that is eaten would pass through far
faster and with little absorption, Colonel Melanson said.
He said the long-term risks were tiny compared with the risk of being killed
outright by the weapon.
The study, conducted by contractors led by the Battelle Memorial Institute,
is scheduled to be released Tuesday. Dr. Kilpatrick said the test results
and the findings would be publicly posted for peer review.
But opponents of using depleted uranium, who have not yet seen the study,
were skeptical of the findings.
"We do know that depleted uranium is radioactive and toxic," said Tara
Thornton, of the Military Toxics Project, a nonprofit group in Lewiston,
Me., which seeks to clean up military pollution. "Studies have shown health
impacts on rats and other things." Depleted uranium is a byproduct of
nuclear weapons production. It is almost entirely a form called Uranium 238,
which is left after the more valuable Uranium 235, the kind useful in bombs
and reactors, has been removed. Depleted uranium is 1.7 times more dense
than lead and penetrates armor easily.
The United States military has never confronted an opponent that used
depleted uranium. Most exposure to American military personnel has been a
result of fire from their own forces.