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RAD465 XRAY TUBE
RAD465 Image Prod/QA
| Term | Definition |
|---|---|
| AC SUPPLY | supplies circuit with 220-2040V; alternating current |
| MASTER WALL SWITCH | connection btwn external power and xray unit |
| FUSES | stops connection in the event a hazard develops in the xray circuit (power surge/backfire) |
| LINE VOLTAGE COMPENSATOR | adjusts # of turns available on the autotransformer; makes small adjustments to get exactly 220V |
| LINE VOLTAGE METER | measures how much voltage is coming in; need precisely 220V so kVp is not variable |
| AUTOTRANSFORMER | single coil; runs on self-induction; makes minor adjustments; based on kV selection |
| MAJOR/MINOR KVP SELECTORS | corresponds to kV selections minor = 1s major = 10s |
| PRE-READING KV METER | provides estimated kV to be used on secondary side |
| EXPOSURE SWITCH | single-blade switch that closes circuit btwn auto & step up transformer when exposure button is pushed; dead-man switch |
| EXPOSURE TIMER CIRCUIT | controls duration of exposure (timer) |
| 5 TYPES OF EXPOSURE TIMERS | Mechanical - no longer used Synchronous - works in multiples of 60 Electronic - most complex & accurate mAs timer - uses highest & safest mA with shortest time AEC - ionization chambers btwn pt and the detector |
| mA SELECTOR | regulates amperage; how many electrons we boil off; 3-6amps |
| FOCAL SPOT SELECTOR | selects the size of the filament; small (0.1-1.0mm) vs. large (0.3-2.0mm)based on mA selected |
| STEP DOWN TRANSFORMER | aka filament transformer; mutual induction; steps down voltage to 8-12V |
| FILAMENT CIRCUIT | controls the # of electrons that are boiled off |
| STEP UP TRANSFORMER | steps up voltage to kilovoltage! mutual induction separates xray circuit into primary and secondary side |
| Formulas for turns ratio, voltage, current | Transformer Law(voltage): Ts/Tp = Vs/Vp Turns ratio:Ts/Tp Current: Ts/Tp = Ip/Is |
| TURNS RATIO > 1 | step-up transformer |
| TURNS RATIO < 1 | step-down transformer |
| DIODES FOR RECTIFICATION | changes alternating current to direct current; at the 0 tap point; gives the mA meter an accurate current |
| 2 DIODES v. 4 DIODES | 2 will nullify negative cycle 4 will flip negative into positive |
| mA METER | measures milliAmps / # of electrons located at 0 tap point(midpoint) of the secondary side connected to ground to safely place on control panel uses 4 rectifiers to have direct current |
| PRIMARY/LOW VOLTAGE SIDE | pre-step-up transformer contains most of the elements available on the control panel except for the mA meter |
| SECONDARY/ HIGH VOLTAGE SIDE | post-step-up transformer contains the mA meter & rectifiers |
| ANODE | A+ positive side of the xray tube |
| CATHODE | C- negative side of the xray tube |
Created by:
SavHoffman25
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