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xray circuit
rad
| Question | Answer |
|---|---|
| single-phase 2 pulse | full-wave rectification produces voltage ripple of 2 pulses per Hz or 120 pps |
| three-phase 6 pulse | full-wave rectification produces voltage ripple of 6 pulses per Hz or 360 pps |
| three-phase 12 pulse | full-wave rectified, 12 diode, produces voltage ripple of 12 pulses per Hz or 720 pps |
| V x A = W | power rating formula- the greatest load the generator can apply to the tube |
| diagnostic x-ray range | 10 to 1200 mA,0.001 to 10 seconds,25 to 150 kVp |
| incoming line current is supplied | in the form of a 3-phase power cycle |
| when full-wave rectification is applied to a 3-phase current, a _____ ripple is produced | voltage |
| in the US, the incoming line voltage to an x-ray unit is approximately 120 volts | false |
| the basic x-ray circuit is divided into the main circuit and the anode circuit | false |
| a filament may break due to | vaporization |
| as more electrons build up in the area of the filament, their negative charges oppose the emission of additional electrons. this phenom is | space charge effect |
| as actual focal spot size increases, the effective focal spot size | increases |
| as the angle of the anode increases & the incident electron beam size remains the same, the effective focal spot size | increases |
| cracking of the anode occurs | with failure to warm up the tube |
| driving the thermionic cloud from the cathode to the anode requires | a large potential difference -high voltage |
| each is a part of the cathode assembly except filament, stator, focusing cup, associated wiring | stator |
| filament materials are chosen for their | high melting points |
| melting of the anode occurs | when the stator fails & the rotor ceases to turn |
| pitting of the anode occurs | with extended use |
| production of the thermionic cloud requires | more than kV, resistance, amperage |
| the actual focal spot is controlled by | length of the filament |
| the area of the focal spot that is projected out of the tube toward the object is | the effective focal spot |
| the electrical device used to adjust mA selection | variable resistor -rheostat |
| the exact point in the x-ray unit where photons are created is the | focal spot |
| the focusing cup has a ___ charge | negative |
| function of the cathode | produce the thermionic cloud |
| function of the stator & rotor | rotate the anode |
| most common diagnostic radiography target angle is | 12 degrees |
| the only portion of the anode assembly placed outside the vacuum of the envelope is the | stator |
| the physical area of the focal track affected by the electron beam is the | actual focal spot |
| the rotor is located___ the stator & ___ the envelope | inside, inside |
| use of the line-focus principle causes a problem known as the | anode heel effect |
| what type of radiation is composed of photons not produced at the focal spot | off-focus & extrafocal |
| where is the stator of the anode induction motor located | outside the glass envelope & outside the rotor |
| conditions needed to produce x-rays | a source of electrons, a vacuum, a large potential difference |
| as the actual focal spot size increases, the effective focal spot | increases |
| at what point in the x-ray circuit is the rectification circuit located | between the step-up transformer & the x-ray tube |
| backup time | cannot exceed the tube limit & should be set at 150% of expected manual mAs |
| the exposure switch is found between the | autotransformer & the timer circuit |
| the kVp control is found between the | incoming line & the exposure switch |
| the mA control is found between the | incoming line & the step-down transformer |
| the protective housing controls leakage & scatter radiation through | adsorption |
| the time control is found between the | exposure switch & the step-up transformer |
| what affects production of the termionic cloud | filament length, temperature, diameter |
| according to the anode heel effect, radiation intensity is greater on the anode side | false |
| as the anode target angle increases, the primary beam field size increases | true |
| in radiology, the term focal spot size refers to the effective focal spot | true |
| most x-ray tubes have a dual-focus arrangement | true |
| off-focus radiation is of significantly lower energy than the primary beam itself | true |
| the cathode is the negative side of the x-ray tube | true |
| the line-focus principle is used to reduce the actual area of the focal spot | false |
| when the target angle is less than 45 degrees, the effective focal spot is smaller than the actual focal spot | true |
| heat unit rectification constants | rect.1 = 1.00; rect. 3 = 1.35; rect. hf = 1.40 |
| minimum reaction time | amount of time required to end exposure in AEC; 0.001 sec. |
| maximum exposure per U.S. public law | 600 mAs |
| kVp x mA x time x rectification constant | heat unit formula |
Created by:
reetherockgoddess