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17 Questions

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X-ray Tubes: Crookes and Coolidge Tubes

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Questions and Answers

What is unique about the Crookes' tube compared to other x-ray tubes?

It is enclosed in a vacuum

It has a metal envelope

It uses a thermionic effect to produce electrons

It contains known volumes of various gases (correct)

What is the primary function of the tube housing?

To produce x-rays

To protect against electric shock and absorb leakage radiation (correct)

To accelerate electrons

To heat the tungsten filament

What is the source of electrons in the production of x-rays in the Coolidge tube?

The cathode (correct)

The anode

The thermionic effect

The glass envelope

What is the purpose of the vacuum pump in the x-ray tube?

To permanently seal the glass envelope Signup and view all the answers

What is the primary beam in an x-ray tube?

X-rays that pass through the thin window Signup and view all the answers

What is the material used to make the glass envelope in the x-ray tube?

Pyrex Signup and view all the answers

What is the main purpose of the x-ray tube?

To produce an x-ray beam Signup and view all the answers

What material is often used for the x-ray tube's filament due to its high melting point?

Tungsten Signup and view all the answers

What occurs when a current is applied to the filament in an x-ray tube?

Thermionic emission Signup and view all the answers

What is the function of the focusing cup in an x-ray tube?

To focus the electron beam Signup and view all the answers

What is the term for the cloud of electrons that forms around the filament in an x-ray tube?

Space charge Signup and view all the answers

What is the advantage of having a vacuum in an x-ray tube?

It extends the life of the tube Signup and view all the answers

What is the primary function of the anode in an X-ray tube?

To conduct high voltage from the cathode Signup and view all the answers

Why is tungsten commonly used as the anode target material?

Because of its high atomic number and high melting point Signup and view all the answers

What is the purpose of the target area in an X-ray tube?

To create X-ray photons Signup and view all the answers

What determines the effective focal spot size?

The length of the filament and the anode target angle Signup and view all the answers

What is the advantage of using tungsten-rhenium alloys as the anode target material?

They have a high atomic number and high melting point Signup and view all the answers