RADT_152_Unit_2_Exam - RADT 152 Radiation Protection Unit 2...

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Unformatted text preview: RADT 152 Radiation Protection Unit 2 Unit Exam Interactions of XRadiation with Matter 2 2.0 Interaction of X-Radiation with Matter Comprehensive Unit Exam Directions: 1. Write your name and the date on your Scantron form. Identify the subject as the course number (for example, RADT 102) along with the test number (for example, Unit 1). 2. For each of the questions below, select the best answer to the question. 3. Using a No. 2 pencil, fill in the appropriate answer on the answer sheet. 4. Erase unwanted answers completely. Questions with two or more filled in answer spaces are graded as incorrect. 5. Answer all questions. 6. You have a maximum 15 minutes to complete the following 25 questions. (Note this time factor approximates the amount of time you would be allowed to answer the same number of questions on the Registry examination in radiography) 1. Primary radiation is produced by the emerging x-ray photon beam. A. True B. False 2. Primary radiation is produced by bombarding a positively charged target with a stream of ________ electrons in a highly evacuated tube. A. Low speed B. Medium speed C. Positively charged D. High Speed E. Negatively charged 3 3. Exit or image- formation photons are photons that emerge from the image receptor and strike the object. A. True B. False 4. Which are two types of interactions between x-radiation and matter are important in diagnostic radiation? A. Photodisintegration, Pair Production B. Compton Scattering, Photo absorption C. Pair Production, Compton Scattering D. Photoelectric Absorption, Coherent Scattering E. Coherent Scattering, Pair Production 5. What are two bi-products of photoelectric absorption? 1. 2. 3. 4. 5. X-ray shadow Florescent yield Characteristic photon Auger electron Photoelectron A. 1, 2 B. 2, 4 C. 3, 5 D. 2, 5 E. 3, 4 6. Mass density and thickness are two differences in absorption properties that have affects on attenuation by increasing photon absorption. A. True B. False 7. What happens when a photon is completely absorbed by tissue atoms? A. Small-angle scatter B. Image-formation photons C. Attenuation D. Photoelectric interactions E. Primary radiation 4 8. Another name for Compton Scattering is: A. Thompson Scattering B. Rayleigh Scattering C. Coherent Scattering D. Pair Production E. Modified Scattering 9. Primary radiation and the diagnostic x-ray beam are the same thing. A. True B. False 10 The importance of a Thompson scattering electron is that the electron processes excess kinetic energy and is capable of ionizing atoms. A. True B. False 11 Mass and density thickness make the presence of bone more visible on radiographs. A. True B. False 12 This occurs when there is a reduction of the number of primary photons in the x-ray beam through absorption and scatter as the beam passes through the object in its path. A. Photodisintegration B. Primary radiation C. Image formation D. Small-angle scatter E. Attenuation 13 Photoelectric absorption energy is of value in __________________. A. Therapeutic radiology B. Diagnostic radiology C. Not important to any energy range D. None of the above 5 14 Compton scattering occurs in ________________________ A. Therapeutic radiology B. Diagnostic radiology C. Surgery D. None of the above 15 Pair production occurs in ________________________. A. Therapeutic radiology B. Diagnostic radiology C. Dental X-Ray machinery D. None of the above 16 Photodisintegration occurs in this environment. A. Therapeutic radiology B. Diagnostic radiology C. Non Destructive Testing D. None of the above 17 Coherent scattering occurs in this environment. A. Therapeutic radiology B. Diagnostic radiology C. Veterinary radiology D. None of the above 18 Modified scattering occurs here. A. Therapeutic radiology B. Diagnostic radiology C. Nuclear Medicine D. None of the above 19 Compton scattering is not responsible for most of the scattered radiation produced during a radiologic procedure. A. True B. False 6 20 Which of the five processes is most responsible for contrast between bone and soft tissue in diagnostic radiology. A. Coherent Scattering B. Pair Production C. Photoelectric Absorption D. Photodisintegration E. Compton scattering 21 Photoelectric absorption results in increased patient doses and contributes to biological damage A. True B. False 22 Photoelectric absorption is responsible for all directional scatter, (could be small-angle scatter, back scatter or side scatter). A. True B. False 23 When there is an interaction between an x-ray photon and an inner shell electron in which the photon surrenders all its kinetic energy to the orbital electron and ceases to exist resulting in the electron escaping its inner shell and leaving the atom. A. Coherent Scattering B. Compton Scattering C. Pair Production D. Photoelectric Absorption E. Photodisintegration 24 Pair Production is also called: A. Thompson Scattering B. Small-angle scattering C. Image formation D. Attenuation E. Annihilation 7 25 When there is an interaction between an incoming x-ray photon and a loosely bound outer shell electron of an atom in the irradiated object in which the photon surrenders a portion of its kinetic energy to dislodge the electron from its outer shell orbit and then continues in a new direction A. Coherent scattering B. Photoelectric scattering C. Compton scattering D. Pair Production E. Photodisintegration ...
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This note was uploaded on 11/12/2011 for the course RADIOLOGY 152 taught by Professor Walters during the Spring '11 term at Boise State.

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