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RADT 465 Equip & QC
ARRT Registry Review
| Question | Answer |
|---|---|
| What percentage of the x-ray beam is comprised of Brems? | 70-90% (p.431) |
| What percentage of the x-ray beam is comprised of Characteristic? | 10-30% (p.431) |
| A high-speed electron passing near or through an atom that slows down and is deflected from its course with a loss of energy | Bremsstrahlung radiation (p.431) |
| A high-speed electron encounters an atom and ejects a K shell electron and adjacent electrons fill the vacancy | Characteristic radiation (p.431) |
| What is the distance between two consecutive wave crests? | Wavelength (p.432) |
| A relatively low-energy photon uses all its energy to eject an inner shell electron, gives up energy in form of characteristic ray | Photoelectric effect (p.434) |
| A fairly high-energy photon ejects an outer shell electron causing image fog and personnel dose | Compton Scatter (p.434) |
| A low-energy photon interacts with an atom, the photon disappears as it is absorbed leaving atom in an excited state | Coherent Scatter (p,435) |
| What is another name for Coherent Scatter? | Classical Scatter (p.435) |
| Change mechanical energy to electrical energy | Generators (p.437) |
| Change electrical energy to mechanical energy | Motors (p.437) |
| Electrical current flowing through a conductor in only one direction and with constant magnitude | direct current (p.437) |
| What is an example of a direct current? | battery (p.437) |
| Characterized by varying amplitude and periodic reversal of polarity | alternating current (p.437) |
| A conductive wire shaped into a coil | helix (p.439) |
| A helix supplied with a current | solenoid (p.439) |
| What is another name for step-down transformers? | filament transformers (p.442) |
| What is the anode usually made of? | Tungsten/rhenium alloy (p.445) |
| What type of motor is used to rotate the anode? | induction motor (p.446) |
| The stator is _______ the envelope | outside (p.446) |
| The rotor is ________ the envelope | inside (p.446) |
| The effective focal spot is always ______than the actual focal spot | smaller (p.448) |
| Part of the x-ray circuit that contains most of the devices found on the control console | low-voltage circuit (p.451) |
| Part of the x-ray circuit that varies that current sent to the filament to provide the required mA value | filament circuit (p.451) |
| Part of the x-ray circuit that included the high-voltage transformer, rectification system, and x-ray tube | high-voltage or secondary circuit (p.451) |
| What is the most accurate timer? | electronic timer (p.452) |
| Type of AEC that terminates exposure when a predetermined quantity of air ionization has occurred within the chamber | Ionization chamber (p.453) |
| Type of AEC that terminates exposure when xrays activate a fluorescent screen that produces light and charges a photomultiplier tube | Phototimer (p.453) |
| Type of AEC that terminates exposure using a manual timer | backup timer (p.453) |
| What is the ripple percentage for 3phase 6pulse rectification? | 13% (p.455) |
| What is the ripple percentage for 3phase 12 pulse rectification? | 4% (p.455) |
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