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.
Edited* by Lynn M. Riddiford, Howard Hughes Medical Institute Janelia Farm Research Campus, Ashburn, VA, and approved March 3, 2014 (received for review October 12, 2013)
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Activin signaling and metabolism
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