Muons penetrate much further than X-rays, they do essentially zero damage, and they are provided for free by the cosmos.
Image credit: Science Source/Digital Globe.
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Edited by James P. Allison, University of California, Berkeley, CA, and approved August 12, 2002 (received for review June 8, 2001)
Edited by James P. Allison, University of California, Berkeley, CA, and approved August 12, 2002 (received for review June 8, 2001)
↵‡ To whom correspondence should be addressed. E-mail: rboismenu{at}repligen.com.
This paper was submitted directly (Track II) to the PNAS office.
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