ほう、自作CT
http://gigazine.net/news/20131025-opensource-desktop-ct-scanner/
線源はどうしているんだろう？
http://www.tricorderproject.org/blog/towards-an-inexpensive-open-source-desktop-ct-scanner/
I have a 1uCi Cadmium-109 check source on its way (as well as a pound of lead shielding to help put together a rough collimator). Cd-109 is the lowest-energy radioisotope that I could find, that emits around 22keV if I remember correctly ― which is absorbed about 50% by 2cm of tissue, so I think there should be usefully contrastive absorption for things like vegetables. I was also considering a Barium-133 source, which is higher energy (80-120keV, I think), so perhaps more suitable for things that have some small amount of metal, but Ba-133 is not monochromatic. These radioisotope check sources are sealed in epoxy,
あー、エポキシ封止の放射線源か〜
