Irradiation using the gamma radiation emitted from the decay of 60-Co isotopes is still a standard method for e.g. sterilizing medical implants. https://en.wik

Irradiation using the gamma radiation emitted from the decay of 60-Co isotopes is still a standard method for e.g. sterilizing medical implants. https://en.wikipedia.org/wiki/Cobalt-60 https://en.wikipedia.org/wiki/Cobalt-60 I've been to such facilities (in Europe) and typically they are pretty diligent with their radiation protection. But of course they are industrial facilities and therefore look more like a warehouse, and less like a laboratory. Kept under water for shielding, the racks with the radiation sources look like this, they emit a very, very pretty blue glow (Čerenkov radiation): http://www.brucepower.com/cobalt-removed-during-unit-8-outage-will-help-ensure-safe-medical-treatment-for-hospital-patients-worldwide/ http://www.brucepower.com/cobalt-removed-during-unit-8-outag... http://www.phy.olemiss.edu/~cavaglia/courses/Phys_622/ http://www.phy.olemiss.edu/~cavaglia/courses/Phys_622/