Exam (elaborations)
Irene Gold Part 2 – Xrays – Questions/Answers
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- IRENE GOLD
- Institution
- IRENE GOLD
Irene Gold Part 2 – Xrays – Questions/Answers
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Irene Gold Part 2 – Xrays – Questions/AnswersWhat causes the production of xrays generally ✔️Ans - When fast moving
electrons collide with matter in any form
How are xrays made in a tube ✔️Ans - Directing a stream of electrons at a
high speed against a metal target
As they interact with the atoms of the target, the electrons give up most of
their energy in the form of heat but 1% of the energy is emitted as xrays
Where is the xray tube located ✔️Ans - Inside a glass envelope (pyrex)
inside the tube housing
What does the tube consist of ✔️Ans - Two electrodes:
Cathode/anode
What does the cathode consist of ✔️Ans - Large filament
Small filament
Focusing cup
What is the function of the filament and what is it made of ✔️Ans - Function
is to serve as the source of electrons in the production of xrays
Made of tungsten
When does thermionic emission occur at the filament ✔️Ans - When a
current is applied to the filament; the coil of the wire becomes very hot,
boiling off electrons
What does the temp of the filament control ✔️Ans - Quantity of electrons
(mA) emitted from it (boiled off)
What does the number of electrons emitted determine ✔️Ans - Number of
xrays created
, What is the focusing cup aka ✔️Ans - The filament cup
What is the focusing cup and what occurs here ✔️Ans - The part of the
cathode and encases the two filaments
Thermionic emission
What is the anode ✔️Ans - The positive electrode in the xray
What kind of anode is in most x ray machines? What is the function of the
special anode ✔️Ans - Rotating anode
Rotating target is to dissipate the heat generated
What is the focal spot ✔️Ans - The exposed area of the tugsten target of the
anode
What determines the size of the focal spot ✔️Ans - Determined by the size
of the filament that is chosen
What size filament provides better detail ✔️Ans - Smaller
What is the line focus principle ✔️Ans - Has the effect of making the actual
focal spot size appear smaller when viewed from the position on the film
The smaller the target angle, the smaller the effective spot
stream of electrons narrows down to an effective beam
What is milliamperage (mA) ✔️Ans - Heats the filament causing a boiling off
of electrons
What are milliamperage Per Second (mAs) ✔️Ans - More current = more
electrons produces = more xrays produced = greater radiograph density
(darker)
What is density ✔️Ans - The overall blackening on a film
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