Muons penetrate much further than X-rays, they do essentially zero damage, and they are provided for free by the cosmos.
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Edited by Jay C. Dunlap, Dartmouth Medical School, Hanover, NH, and approved January 13, 2011 (received for review April 7, 2010)
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- Published in issue March 15, 2011.
- Published first February 28, 2011.
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- 1E-mail: forger{at}umich.edu.
Author contributions: D.B.F. designed research, performed research, contributed new reagents/analytic tools, analyzed data, and wrote the paper.
The author declares no conflict of interest.
This article is a PNAS Direct Submission.
This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10.1073/pnas.1004720108/-/DCSupplemental.
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Signal processing in cellular clocks
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- Physical Sciences
- Applied Mathematics
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