Radiation Detectors and Measurement Quiz

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What is the principle of operation of an ionization chamber (IC)?

Ion pairs are produced as energy deposited in the medium by ionizing radiation, and ion pairs are collected by photon receptors placed in the medium.

Electrons are produced as energy deposited in the medium by ionizing radiation, and electrons are collected by charged electrodes placed in the medium.

Protons are produced as energy deposited in the medium by ionizing radiation, and protons are collected by charged electrodes placed in the medium.

Ion pairs are produced as energy deposited in the medium by ionizing radiation, and ion pairs are collected by charged electrodes placed in the medium. (correct)

What factor determines the drift velocity of ion pairs toward the charged electrodes in a gas-filled ionization chamber?

Type and pressure of solid

Type and pressure of plasma

Type and pressure of gas (correct)

Type and pressure of liquid

Why is the voltage (V) between electrodes increased in a gas-filled ionization chamber?

To reduce the ionization potential of the gas

To increase the amount of radiation interactions

To decrease the drift velocity of ions

To collect all ion pairs produced by impinging radiation (correct)

What happens if the voltage (V) remains below that required to produce additional ion pairs in a gas-filled ionization chamber?

Only ion pairs resulting directly from interactions of ionizing radiation with gas are received by the collecting electrodes Signup and view all the answers

Which type of detector produces ion pairs from energy deposited by ionizing radiation?

Ionization chamber Signup and view all the answers

What is the function of charged electrodes in an ionization chamber?

To collect the ion pairs produced by ionizing radiation Signup and view all the answers

In an ionization chamber, what happens when radiation enters the chamber?

Electrical current is produced due to the ion pairs collected by electrodes Signup and view all the answers

What is the purpose of a coaxial ionization chamber?

To detect radiation from low activity radioactive sources Signup and view all the answers

In a pulse type ionization chamber, why is only a portion of the reduction in voltage utilized in forming the voltage pulse?

To ensure rapid response Signup and view all the answers

Why is the use of a direct current (dc) amplifier unsatisfactory for small currents from an ionization chamber?

It introduces instability and zero drift Signup and view all the answers

What is the purpose of using an electrometer with an ionization chamber?

To measure small currents more accurately Signup and view all the answers

Which method is used to measure the amplified alternating current in a current type ionization chamber?

V-drop method Signup and view all the answers

What happens as positive ions approach the case (cathode) in a pulse type ionization chamber?

+ve charge on the electrode increases Signup and view all the answers

Why are heavier positive ions mentioned to migrate more slowly toward the negative case (cathode) in a pulse type ionization chamber?

Due to their larger mass and size Signup and view all the answers

What happens if the kinetic energy of an alpha particle is dissipated completely within the collecting volume of an ionization chamber?

Ion pairs are produced and collected by electrodes Signup and view all the answers

In a parallel-plate ionization chamber, what does the central electrode consist of?

A straight wire or wire loop charged positively with respect to surrounding cylindrical case Signup and view all the answers

Ion pairs in a gas-filled ionization chamber are collected by charged electrodes placed in the medium.

True Signup and view all the answers

The drift velocity of ion pairs toward the charged electrodes in a gas-filled ionization chamber depends on the type and pressure of the gas, and the voltage and distance between electrodes.

True Signup and view all the answers

The voltage between electrodes in a gas-filled ionization chamber is increased until all ion pairs produced by impinging radiation are collected.

True Signup and view all the answers

The voltage (V) remains below that required to produce additional ion pairs in a gas-filled ionization chamber.

True Signup and view all the answers

Ion pairs that result directly from interactions of ionizing radiation with gas in the chamber migrate to the collecting electrodes.

True Signup and view all the answers

The cross section of a pulse ionization chamber consists of only one central electrode.

False Signup and view all the answers

The pulse type ionization chamber utilizes the entire reduction in voltage to form the voltage pulse.

False Signup and view all the answers

The heavier positive ions migrate more rapidly toward the negative case (cathode) in a pulse type ionization chamber.

False Signup and view all the answers

When radiation enters the ionization chamber, it results in the production of electrical current or V pulses as ion pairs are collected by the electrodes.

True Signup and view all the answers

If the voltage (V) remains below that required to produce additional ion pairs in a gas-filled ionization chamber, no electrical current will be produced.

True Signup and view all the answers

If the kinetic energy of an alpha particle is dissipated completely within the collecting volume of an ionization chamber, a specific number of ion pairs are produced.

True Signup and view all the answers

The voltage (V) between electrodes is increased in a gas-filled ionization chamber to facilitate the migration of positive ions toward the central electrode.

False Signup and view all the answers

The charged electrodes in an ionization chamber serve to create an electric field that facilitates the collection of ion pairs by inducing an electrical current.

False Signup and view all the answers

The principle of operation of an ionization chamber involves the production of alternating current by the collection of electrons at the anode.

False Signup and view all the answers

The purpose of using an electrometer with an ionization chamber is to measure small currents accurately by converting the signal from the ionization chamber into direct current (dc).

False Signup and view all the answers

A coaxial ionization chamber typically consists of a central electrode in the form of a straight wire or wire loop charged negatively with respect to the surrounding cylindrical case.

False Signup and view all the answers

Radiation Detectors and Measurement Quiz

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Questions and Answers

What is the principle of operation of an ionization chamber (IC)?

What factor determines the drift velocity of ion pairs toward the charged electrodes in a gas-filled ionization chamber?

Why is the voltage (V) between electrodes increased in a gas-filled ionization chamber?

What happens if the voltage (V) remains below that required to produce additional ion pairs in a gas-filled ionization chamber?

Which type of detector produces ion pairs from energy deposited by ionizing radiation?

What is the function of charged electrodes in an ionization chamber?

In an ionization chamber, what happens when radiation enters the chamber?

What is the purpose of a coaxial ionization chamber?

In a pulse type ionization chamber, why is only a portion of the reduction in voltage utilized in forming the voltage pulse?

Why is the use of a direct current (dc) amplifier unsatisfactory for small currents from an ionization chamber?

What is the purpose of using an electrometer with an ionization chamber?

Which method is used to measure the amplified alternating current in a current type ionization chamber?

What happens as positive ions approach the case (cathode) in a pulse type ionization chamber?

Why are heavier positive ions mentioned to migrate more slowly toward the negative case (cathode) in a pulse type ionization chamber?

What happens if the kinetic energy of an alpha particle is dissipated completely within the collecting volume of an ionization chamber?

In a parallel-plate ionization chamber, what does the central electrode consist of?

Ion pairs in a gas-filled ionization chamber are collected by charged electrodes placed in the medium.

The drift velocity of ion pairs toward the charged electrodes in a gas-filled ionization chamber depends on the type and pressure of the gas, and the voltage and distance between electrodes.

The voltage between electrodes in a gas-filled ionization chamber is increased until all ion pairs produced by impinging radiation are collected.

The voltage (V) remains below that required to produce additional ion pairs in a gas-filled ionization chamber.

Ion pairs that result directly from interactions of ionizing radiation with gas in the chamber migrate to the collecting electrodes.

The cross section of a pulse ionization chamber consists of only one central electrode.

The pulse type ionization chamber utilizes the entire reduction in voltage to form the voltage pulse.

The heavier positive ions migrate more rapidly toward the negative case (cathode) in a pulse type ionization chamber.

When radiation enters the ionization chamber, it results in the production of electrical current or V pulses as ion pairs are collected by the electrodes.

If the voltage (V) remains below that required to produce additional ion pairs in a gas-filled ionization chamber, no electrical current will be produced.

If the kinetic energy of an alpha particle is dissipated completely within the collecting volume of an ionization chamber, a specific number of ion pairs are produced.

The voltage (V) between electrodes is increased in a gas-filled ionization chamber to facilitate the migration of positive ions toward the central electrode.

The charged electrodes in an ionization chamber serve to create an electric field that facilitates the collection of ion pairs by inducing an electrical current.

The principle of operation of an ionization chamber involves the production of alternating current by the collection of electrons at the anode.

The purpose of using an electrometer with an ionization chamber is to measure small currents accurately by converting the signal from the ionization chamber into direct current (dc).

A coaxial ionization chamber typically consists of a central electrode in the form of a straight wire or wire loop charged negatively with respect to the surrounding cylindrical case.

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