You can download the pdf here:
http://www.ippnw.org/PDF%20files/PSR2005RNEP.pdfhttp://www.nti.org/e_research/e5_publications_NW.html#nuclearweapons25Projected Casualties Among US Military Personnel and Civilian Populations from the Use of Nuclear Weapons Against Hard and Deeply Buried Targets
Peter Wilk, Sarah Stanlick, Martin Butcher, Michael McCally, Ira Helfand, Robert Gould, John Pastore, Physicians for Social Responsibility, May 2005
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Over the last decade, some U.S. political and military leaders have expressed increasing concerns about the potential use of nuclear, biological or chemical (NBC) weapons against the United States and its allies. This potential threat has led to an increasing willingness of American strategists to consider the use of nuclear weapons for counterproliferation. To this end, the President’s budget requests have proposed funding for the Robust Nuclear Earth Penetrator (RNEP) a “bunker-busting” nuclear bomb, intended to penetrate hard surfaces such as rock
and explode underground. To fulfill plans for development of an RNEP to be ready for deployment by 2013, the administration has pursued the adaptation of an existing bomb, the B83, with a yield of 1.2 megatons (approximately 80 times the explosive power of the bomb used on Hiroshima). Yet recently published analysis by both the National Academy of Sciences and independent physicists, echoed in Congressional testimony by the head of the National Nuclear Security Administration,
concludes that nuclear earth penetrating weapons cannot penetrate deeply enough to contain underground a nuclear explosion and the resulting radiation. Using a computer model developed by the Department of Defense, Physicians for
Social Responsibility (PSR) calculates that the use of such a weapon against targets in Iran or North Korea could cause millions of deaths, and lead to millions more acute and long-term health effects for U.S. military personnel and local
populations in the affected regions. In one scenario, use of the RNEP against Isfahan in Iran, as many as 20,000 US military personnel stationed in Afghanistan and 35 million innocent civilians in Iran, Afghanistan, Pakistan and India could
receive doses of radiation high enough to cause a significant health impact, including as many 3 million deaths. These factors should weigh heavily against proceeding with the RNEP program.
Earth Penetrating Nuclear Warheads against Deep Targets: Concepts, Countermeasures, and Consequences
Ivan Oelrich, Blake Purnell, Scott Drewes, The Federation of American Scientists (FAS), April 2005
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Attacking “hard and deeply buried” targets is the chief justification for developing new capabilities for nuclear weapons or even a new generation of nuclear weapons. The proposed Robust Nuclear Earth Penetrator (RNEP) and possible future nuclear weapons are specifically designed to destroy underground facilities. This paper very briefly examines the concept of how and why nuclear earth penetrating weapons would be used, a possible countermeasure, and the consequences of their use. We find that attacking underground targets with nuclear weapons is conceptually unsound, countermeasures are available, and the consequences of an attack would be grave.