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
Bremsstrahlung literally means “braking.” When a high velocity electron passes through a tungsten atom, avoiding the electrons, yet coming close enough to the nucleus to be affected by the positively charged electric field of the nucleus, the change of direction, or braking, causes a release of x-rays known as Bremsstrahlung.
(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.
(A) They increase in direct proportion.
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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