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.
CHEMISTRY, MICROBIOLOGY Correction for “Variable genetic architectures produce virtually identical molecules in bacterial symbionts of fungus-growing ants,” by Clarissa S. Sit, Antonio C. Ruzzini, Ethan B. Van Arnam, Timothy R. Ramadhar, Cameron R. Currie, and Jon Clardy, which appeared in issue 43, October 27, 2015, of Proc Natl Acad Sci USA (112:13150–13154; first published October 5, 2015; 10.1073/pnas.1515348112).
The authors note that the GenBank accession number CP010890 should instead appear as CP010990.