The fact that X-rays were a form of electromagnetic
radiation of a wavelength comparable to the distance between atoms
in a crystal was not shown until 1912.
Röntgen did not try to patent the use of X-rays for
medical imaging but said that he preferred that it benefit mankind
as a whole. He gave the money for the first Nobel prize in physics
to University of Wurzburg. Röntgen did not want X-rays named
after himself, as they are today in many languages.
I am not a good one to talk to about trying to kill cancer
with radiation. Maybe the good of the whole compensates for
See also in The book of science:
Readings on wikipedia: