Question:
A setting in an X-ray machine indicates
A setting in an X-ray machine indicates
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X-Ray Tube Circuits:
Amperage (A) in filament circuit $\rightarrow$ Filament Current (Heating).
Milliamperage (mA) across anode-cathode $\rightarrow$ Tube Current (X-ray quantity).
Kilovoltage (kVp) $\rightarrow$ Potential Difference (X-ray quality/penetration).
Amperage (A) in filament circuit $\rightarrow$ Filament Current (Heating).
Milliamperage (mA) across anode-cathode $\rightarrow$ Tube Current (X-ray quantity).
Kilovoltage (kVp) $\rightarrow$ Potential Difference (X-ray quality/penetration).
Updated On: Sep 7, 2026
- Tubular current
- Filament current
- Potential difference
- Frequency
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Thermionic emission physics in the X-ray tube: the low-voltage filament current ($I_f$, in Amperes) heats the tungsten cathode filament to boil off electrons.
Key Formula or Approach:
\[ \text{Filament Current } (3 - 5\text{ Amperes, Low Voltage } \approx 10\text{V}) \xrightarrow{\text{Heats Cathode}} \text{Thermionic Emission} \longrightarrow \text{Tube Current (mA)} \]
Step 2: Detailed Explanation:
In X-ray machine electrical circuit physics:
- The Amperage (A) setting in the filament step-down heating circuit controls the Filament Current ($3 - 6\text{ A}$ at $6 - 12\text{ V}$).
- Heating the tungsten filament cathode produces a space-charge cloud of free electrons by thermionic emission.
- When high voltage (kVp) is applied across the tube, these electrons are accelerated across the tube, constituting the Tube Current (measured in mA).
Step 3: Final Answer:
Thus, the A setting indicates Filament current, corresponding to option (B).
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