ThePhysicsofRadiology-chapter1-2课件.ppt

ＴＨＥ　ＰＨＹＳＩＣＳ　ＯＦ　ＲＡＤＩＯＬＯＧＹ;Atoms;Constitution protons neutrons Q: How to know the structure of the nucleus? Q: Properties of protons and neutrons: charge and mass mass number: A protons + neutrons neutrons = A-Z; Isotope definition: Atoms composed of nuclei with the same number of protons but different number of neutrons are called isotopes. stable or unstable ; disintegration and radioactive; ;Atomic Mass;Hydrogen Z = 1;Helium Z = 2;Elemental particles;Elemental particles;Elemental particles;Elemental particles;Elemental particles;Elemental particles;Elemental particles;Elemental particles;Elemental particles;Extranuclear structure;The outermost orbit Chemical properties and valence repeat inert gas : He, Ne, … alkaline elements: lithium, sodium,…;Atomic Energy levels;Nuclear Energy levels;Quantum nature of radiation;Quantum nature of radiation;Electromagnetic Spectrum;Electromagnetic Spectrum;Electromagnetic Spectrum;Electromagnetic Spectrum;Electromagnetic Spectrum;Electromagnetic Spectrum;Electromagnetic Spectrum;Electromagnetic Spectrum;Binding energy K radiation, BE: 70000ev L radiation, BE: 11000ev M radiation, BE: 2500ev;Radiation of energy from an atom;summary