TCDHA Radiography Theory Midterm Review Questions and Answers (Graded A+)

Scatter radiation - ANSWER-- form of secondary radiation - result of xray photon deflected in all directions travelling to all parts of client's body and to all areas of the op - detrimental to client and radiographer Compton scatter - ANSWER-- Evidence of ionization - xra photon collides w outer shell + gives up part of its energy to eject electron from it's orbit - ejected electron is known as compton or recoil electron Coherent scatter - ANSWER-- unmodified scatter - when low energy photons interact with outer shell electron - no changes in atom - no ionization - 8% percent of xradiation PID (positioning indicating device) - ANSWER-- projects from tube head and used to direct xradiation to client's face - lead lined to prevent scatter radiation - cones are short or long (8" or 16") Milliamperage - ANSWER-- refers to totaly quantity of xrays produced - controls film blackening Higher mA, darker the xray kV - ANSWER-Higher kVp = higher penetrating power Tungsten target - ANSWER-Aka wolfram Attached to copper stem Speeding electrons hit the tungsten target Aluminum filter - ANSWER-Filters out long wavelengths with poor penetration power Ionization - ANSWER-The production of ions, or the process of converting an atom into ions Deals with only electrons Primary Radiation - ANSWER-- xray thats produced at target or anode and exit the tubehead Secondary Radiation - ANSWER-x-radiation that is created when the primary beam interacts with matter. Eg. Soft tissue of head, cranial bones and teeth Scatter radiation - ANSWER-- secondary radiation - result of xray photon deflected in all directions travelling to all parts of the clien'ts body and to all areas of the operatory Electrical force (Binding force) - ANSWER-- electrostatic force or attraction between the positive nucleus and the negative electrons - k shell is strongest Cathod