Canada led the world in the development of radioactive isotopes for medical diagnosis and therapy, says Jacalyn Duffin, a medical historian at Queen's University in Ontario.
安大略省奎恩大学的医学史学家Jacalyn Duffin说，加拿大在医学诊断和治疗领域应用放射性同位素的进程是世界领先的。
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