10 MeV), and photodisintegration (very high energy; > 8-10 MeV) - Maximum compton scattering occurs with hydrogenQ b/o highest electron density. In photoelectric effect, the most tightly bound-inner most electron completely absorbs all energy of falling low energy photonQ, so much so that the photon is completely absorbed and no longer exists and inner orbital electron (now called photoelectron) is ejected. The interaction can occur with other orbital electrons but the most probable interaction is with inner most shell electron. The vacency created in inner shell is filled by an electron from outer orbit with simultraneous emission of X-ray or Auger electron. In Compton Scattering incident higher energy photon transfers only a pa of its energy to a loosely bound outer shell electronQ. and is deflected or scattered off in a new direction with lower energy. The outer shell electron (now called compton/recoil electron) is ejected with no production of X-ray or Auger electron. Charged heavy paicles (such as protons and a-paicles) have a finite range and experience a rapid increase in energy loss near the end of their track (range/path), dumping most of their remaining energies quickly and producing an ionization curve with a peak near end (K/ a Bragg peak). - When a light mass-charged paicle (such as electron or 8-paicle) with high energy passes close to the nucleus's positive electrical field, it is deflected & decelerated by electro static attractions and loses energy in form of X-ray photons called bremsstrahlung or braking radiation. So Bragg peak is produced by charged heavy paicles mainly, whereas Bremsstrahlung radiation is produced by charged light paiclesQ. - Collisional energy losses (& heat production) dominate at lower energyies, whereas radiative losses dominate at higher energies (Vt more efficient X-ray production)Q. Because of dependency on atomic number (Z2) and 1/velocity2; collisional energy losses increases as atomic number increases and paicle velocity decreases. So electrons are stopped sooner in low Z than high Z materialsQ.">