FACULTY OF PHYSICS INTERACTIONS OF IONIZING RADIATION WITH MATTERS DR CHAU VAN TAO DEPARTMENT OF NUCLEAR PHYSICS NATURALSCIENCES UNIVERSITY Questions What is radiation? What is ‘ionizing’ radiation? How do we measure radiation? Where does radiation come from? What are the effects of radiation? Is radiation good for anything? nucleus proton neutron electron Atomic Structure and Radioactive Decay Atomic Structure 253 bin Discovery of Radiation Röntgen 1895 Discovery of X ray Pierre & Marie Curie 1[.]