They're the backbone of nuclear medicine. Medical isotopes — tiny radioactive particles that can be injected into the body — have become the standard treatment for some cancers. They've also brought medical imaging to new levels. And much of the world's supply is produced in Canada.

Read more: http://www.cbc.ca/health/story/2009/05/19/f-medical-isotopes.html#ixzz0uWH0kDeA