TARGET INTERACTIONS 3
Atarget interaction takes place when an electron hits the target onthe anode side after being shot to the cathode side across the tube.There are two types of target interactions in X-Ray production, theBremsstrahlungtarget interactions,and theCharacteristic targetinteractions(Bushberg,2011).The differences between the two types of interactions are based onthe way the two occur and produce X-Rays. Also called the white orgeneral radiation, the Bremsstrahlung Interactionsis an electronic radiation that is generated by the deflection of thepositively charged atomic nuclei by the negatively charged electionsthat are in motion (Bushberg, 2011). The deflection leads to velocityloss, which translates to a loss of energy that is emitted as x-raysthat are called Bremsstrahlung.
Onthe other hand, Characteristic Interactionsinvolve emission of characteristic x-rays that are released fromheavy elements. The rays are produced when the heavy elements maketransitions after an electron interacts with the target atom’sinner shell electron and displaces it (Roberts& Williams, 2007).The rays occur during the ionization of an inner shell electron bythe high energy electrons, leading to the filling of the outer holeby the outer shell electrons. These rays produced are at 59keV andare mostly applied in the processes of imaging.
Thesimilarity between the two types of target interactions is that theyproduce x-rays in processes that involve electron movement thattargets an interaction with an atom or electron. The two interactionsalso involve emission of rays through the use of kinetic energy asthe electrons involved travel and lose energy in the process (Roberts& Williams, 2007).Despite the process similarities, the resulting production of rays isalso used for similar application in imaging.
Bushberg,J.T., Bushberg,J., Seibert, J.A., Leidholdt, E.M, & Boone,J.M. (2011). TheEssential Physics of Medical Imaging. NewYork: Lippincott Williams & Wilkins
Roberts,P.A., & Williams, J.R. (2007). Farr`sPhysics for Medical Imaging. NewYork: ElsevierHealth Sciences