Radioation Physics Quiz prep (HW, practice quiz)
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| The process utilized by the x-ray generator to make electrons escape from the cathode is called: | Thermionic emission
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| X-rays originate in the: | Electron orbits of atom
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| The person who discovered X-rays in 1895 was: | Roentgen
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| The reduction of electromagnetic energy as radiation passes through matter is called: | Attenuation
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| X-rays differ from alpha and beta radiation in that x-rays: | travel at the speed of light
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| X-rays are a form of: | electromagnetic radiation
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| The relationship of the intensity of electromagnetic radiation and the distance from its source is described by: | The Inverse Square Law
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| T or F: Xrays can be focused using electrostatic lenses | False: can be blocked but not focuses
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| T or F? X-rays travel at 300 million M/sec | True
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| T or F? Xrays can penetrate bone | True
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| T or F? X-rays have no mass | True
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| T or F? X rays have no electrical charge | True
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| The high energy x-rays emitted when a K-shell electron is ejected are called: | Characteristic radiation
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| What is synonymous with Compton scatter radiation? | Secondary radiation
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| The radiation created when a passing electron changes speed as it moves through an atom is called: | Bremsstrahlung radiation
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| When X-rays are absorbed and excite electrons, this occurs | Phosphorescence
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| Where does thermionic emission come from? | heat off the cathode
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| The process by which certain materials release light when stimulated by x-ray radiation is called: | Phosphorescence
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| Which of the following have no mass and travel at the speed of light? Alpha radiation; Beta radiation; Ultrasound; X-rays | X-rays
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| X-rays are ionizing radiation because when they encounter atoms in human tissue they can: | Remove orbital electrons
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| When x-rays are absorbed by temporarily exciting electrons in the input phosphor, the energy lost when the x-ray disappears is changed into: | Light
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| Aluminum filtration of x-ray beams is required by law. Which type of radiation does the aluminum selectively filter out? | Soft- low energy x-rays
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| How is the "Roentgen" measurement of radiation made? | Ionizes 1cc of air producing 1 electrostatic unit of charge
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| Name the image intensifier screen which transforms the fluorosope's input phosphor light into electrons? | Photocathode
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| For safety purposes the "maximum permissible dose" of whole body x-radiation allowed to radiologic personnel is: | 5.0 REM/year
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| What is the best way to protect yourself from radiation? | Keep as far away from x-ray source as possible
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| What factor does mAs have the most influence over on the cine film? | Sharpness of resolution
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| What is the main effect of increasing kVp? | Increases penetration
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| The individual points of light that make up the visual display on the fluoro screen are called: | Pixels
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| Coronaries are cined in the------- inch mode (or field or view) | 5 or 7
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| The LV is cined in the _______ inch mode (FOV). | 9
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| The sharpest resolution would be seen on which monitor? | 1024 x 1024
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| A contrast agent with an osmolarity of 1900 would be considered: | Hyperosmolar
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| The new Standard International Unit replacing the REM (Roentgen Equivalent in Man) is the: | Sievert
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| The digital format which allows images acquired by any manufacturer's system to be played on all other manufacturer's systems is called the: | DICOM standard
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| If a cardiology fellow standing 1 meter from a primary beam receives 2 Sieverts of radiation, what do you receive if you are standing 10 meters away? | .02 Sieverts
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| The process utilized by the x-ray generator to make radiation is called: | Thermionic emission
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| Radiation can be measured in different units. What does the unit millirem measure? | Occupational exposure measured at a film badge
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| Leaded eyeglasses are primarily designed to protect you from: | Cataract formation
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| The chemical structure common to all radiographic contrast is a triiordinated: | Benzene ring
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| The term "collimation" refers to: | Using hard contour filters
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| The drug of choice for treating anaphylaxis which may be caused by angiographic contrast is: | Epinephrine
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| Imaging systems are often evaluated by measuring their resolution(line pairs/mm). Resolution describes the following except: Depth of penetration; Discrimination of small structures; Image sharpness; Visibility of anatomical detail | Depth of penetration
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| Non-insulin dependent diabetics who take Glucophage (metformin) should have the drug withheld prior to cardiac cath because Glucophage: | Potentiates contrast nephropathy
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| Your patient Congressman Justin Atholl, has an elevated BUN and creatinine. He should take oral____ before undergoing contrast angiography. | Mucomyst
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| All of the following are forms of electromagnetic radiation except: Light; X-rays: Gamma rays; Sound; Microwaves | Sound
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| All of the following are forms of ionizing radiation except: Radio waves; X-rays; Gamma Rays; Alpha particles; Beta particles | Radio waves
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| Inside the image intensifier, electrostatic lenses focus: | Electrons
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| The x-ray energy that is powerful enough to make a diagnostic image is referred to as___ radiation: | Characteristic
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| The patient radiation exposure during the case is displayed for the staff to monitor in units of: | centiGrays
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| The ability of x-ray equipment to dissipate waste heat is measured in: | Heat units
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| The most important factor in preventing contrast nephropathy post procedure in patients with normal renal function is: | adequate hydration
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| In order to view an angiogram from a prior procedure in a digital system, which of the following devices is required to display the image? | Digital to analog converter
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| According to the inverse square law, intensity is: | Inversely proportional to the square of the distance from the source
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| Inside the X-ray tune the _____________ rotates at 10,000 rpm | Anode
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| The reason the x-ray tube is immersed in oil is to | dissipate excess heat
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