1. COHERENT
  2. PHOTOELECTRIC
  3. COMPTON
  4. PAIR PRODUCTION
  5. PHOTO DISINTEGRATION

1. COHERENT SCATTERING

Scattering – in this x ray interact with matter

Elastic collision – in elastic collision  total kinetic energy of the body remains same

Photon energy = < 10 kev.

X ray photon passing close to the atom cause electron to vibrate at equal frequency  to the incident radiation. •

Wavelength remaining  same as of incident photon to that of emitted photon.

THOMSON

•Single electron involved •No ionization

RAYLEIGH

•All the electrons of an atom. •It is the phenomenon of scattering  of photon particle by the molecule of gas, multiple interaction of incidence radiation to electron of atom.

2. COMPTON

Inelastic collision • High energy photon (100kev or more) •Incident photon loose energy and its gain by the scatter radiation •Amount of energy gain by electron and loose by incident  photon are depend upon angle of scatter and energy of incident photon •Larger angle of scatter of photon, more energy loose to electron. (max 180°) back scatter. •E0 = E2 + E3.

3. PHOTOELECTRIC EFFECT

•Below 100 kev •It is the emission  of electrons or other free carrier  when electromagnetic  Radiation  like visible light, x rays, y rays hits a material, electrons emits electrons. •Photon transfer all its energy to one of orbital electron of the atom. •Absorption of electron by atom leads to ionization by emission of electron  •Electron acquire kinetic energy of amount equal to that of photon  energy •Electron released in this called photoelectron.

TO BE CONTINUE…..

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