Preparing for the Radiography Certification exam? Test your knowledge with two free sample questions taken from the BoardVitals Radiography question bank, which is based on the published ARRT Radiography Content Specifications.
High-velocity electrons (e-) that completely avoid the orbital electrons as they pass through a tungsten atom, yet come close enough to the nucleus of the atom to come under the influence of its positively charged electric field (P+), will produce what type of X-rays?
A.) Characteristic x-rays
B.) Compton X-rays
C.) Bremsstrahlung X-rays
D. ) Thompson X-rays
(C) Bremsstrahlung X-rays
Energy cannot be destroyed; it can only be converted into a different form of energy. Kinetic energy can be converted to potential energy, kinetic energy can also be converted to heat, and heat can be converted back into kinetic energy. Thus, when a high-velocity electron (e-) possessing a great deal of kinetic energy comes under the influence of the positively charged magnetic field of a tungsten nucleus(P+), the force of that magnetic field pulling on the electron causes this electron to lose kinetic energy and change direction. Now when energy is lost in one entity or form, this lost energy is simply converted into another form. In this case, the lost kinetic energy of this electron is converted into x-radiation.
(Bushong 142) Bushong, Stewart C. Radiologic Science for Technologists: Physics, Biology, and Protection, 9th Edition. Mosby, 032008. VitalBook file.
What is the relationship of LET and biological damage?
A.) They increase in direct proportion.
B.) They are inversely proportional.
C.) There is no relationship.
D.) There is a nonlinear nonthreshold relationship.
The LET refers to the linear energy transfer, the amount of energy transferred by ionizing radiation per unit length of tissue traveled. LET is variable between radiation types. High-ionization radiation, including neutrons and alpha particles, cause more biological damage than radiation with a lower LET, including x-rays and gamma rays.
Callaway, W. J. (2013). Mosby’s comprehensive review of radiography: The complete study guide and career planner (6th ed.). St. Louis, MO: Mosby/Elsevier.
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