Radioactive Source and Gas-Filled Detector Quiz

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What type(s) of radiation are being measured when a Geiger counter is used to measure a radioactive source with its cover removed?

Gamma rays only

Beta/alpha particles and gamma rays (correct)

Alpha particles only

Beta particles only

What is the region of operation on the voltage-response curve for a Geiger counter?

Proportional region

Geiger muller region (correct)

Dose calibrator region

Ionization region

Does the pulse mode operation of a gas-filled detector require a high photon flux to produce an accurate reading?

False (correct)

Depends on the type of gas-filled detector

True

Not mentioned in the text

Will a Geiger counter with a short time constant respond quickly to a change in the local radiation field strength?

True Signup and view all the answers

What is the purpose of a pulse height analyzer in a scintillation detector?

Identifies pulses within the energy window Signup and view all the answers

Which semiconductor material is commonly used in commercial intraoperative probes?

CZT Signup and view all the answers

What is the function of a collimator in nuclear medicine imaging?

Absorbs gamma rays going at undesirable angles Signup and view all the answers

What is the main cause of non-uniformity in a gamma camera?

Underlying non-uniformity of the PMTs Signup and view all the answers

What is the stopping condition for a gamma camera image?

Counts Signup and view all the answers

What does dead time refer to in radiation detection?

Minimum time separation between two radiation events required for detection as two separate events Signup and view all the answers

What is involved in calibrating a scintillation detector?

Setting of the lower and upper level discriminators Signup and view all the answers

What is dead time in radiation detection?

Minimum time separation between two radiation events required for detection as two separate events Signup and view all the answers

What causes baseline shift and pulse pile-up in radiation detection?

Signup and view all the answers

What is the primary function of a light pipe in nuclear medicine imaging?

Improves uniformity of gamma camera flood image Signup and view all the answers

What is the primary function of a pulse height analyzer in a scintillation detector?

Identifies pulses within the energy window Signup and view all the answers

What causes baseline shift and pulse pile-up in radiation detection?

Spontaneous electric signal in the detector Signup and view all the answers

Which type of collimator design option will improve the collimator’s overall sensitivity?

Increasing the hole length Signup and view all the answers

What is the appropriate collimator if we want high-quality images of the bones of the hand?

High resolution Signup and view all the answers

What is dead time in radiation detection?

The minimum time separation between two radiation events Signup and view all the answers

Which of the following can be used as the stopping condition for a gamma camera image?

Information density Signup and view all the answers

What is the function of a light pipe in nuclear medicine imaging?

Improves uniformity of gamma camera flood image. Signup and view all the answers

Which of the following semiconductor materials is used in commercial intraoperative probes?

CZT Signup and view all the answers

What is involved in calibrating a scintillation detector?

Setting of the lower and upper level discriminators Signup and view all the answers

What is the percent energy resolution for a Cs137 source with an energy range at half-maximum from 625 keV to 692 keV?

10%; yes, it’s acceptable since it falls within the 8-12% range Signup and view all the answers

What is the appropriate collimator if part of the body being imaged is larger than the collimator’s field of view?

Diverging Signup and view all the answers

What causes non-uniformity in a gamma camera?

Underlying non-uniformity of PMTs Signup and view all the answers

What type(s) of radiation are being measured when a Geiger counter is used to measure a radioactive source with its cover removed?

Gamma rays and alpha particles Signup and view all the answers

According to the standard of practice, the percent energy resolution for Cs137 should fall between:

10%-20% Signup and view all the answers

What is the region of operation on the voltage-response curve for an ionization survey meter?

Ionization region Signup and view all the answers

Does pulse mode operation of a gas-filled detector require a high photon flux to produce an accurate reading?

True Signup and view all the answers

What does the change in charge on one or both plates of a gas-filled detector correlate to?

The amount of radiation present Signup and view all the answers

Identify the region of operation on the voltage-response curve for a Geiger counter.

Geiger muller region Signup and view all the answers

Radioactive Source and Gas-Filled Detector Quiz

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Questions and Answers

What type(s) of radiation are being measured when a Geiger counter is used to measure a radioactive source with its cover removed?

What is the region of operation on the voltage-response curve for a Geiger counter?

Does the pulse mode operation of a gas-filled detector require a high photon flux to produce an accurate reading?

Will a Geiger counter with a short time constant respond quickly to a change in the local radiation field strength?

What is the purpose of a pulse height analyzer in a scintillation detector?

Which semiconductor material is commonly used in commercial intraoperative probes?

What is the function of a collimator in nuclear medicine imaging?

What is the main cause of non-uniformity in a gamma camera?

What is the stopping condition for a gamma camera image?

What does dead time refer to in radiation detection?

What is involved in calibrating a scintillation detector?

What is dead time in radiation detection?

What causes baseline shift and pulse pile-up in radiation detection?

What is the primary function of a light pipe in nuclear medicine imaging?

What is the primary function of a pulse height analyzer in a scintillation detector?

What causes baseline shift and pulse pile-up in radiation detection?

Which type of collimator design option will improve the collimator’s overall sensitivity?

What is the appropriate collimator if we want high-quality images of the bones of the hand?

What is dead time in radiation detection?

Which of the following can be used as the stopping condition for a gamma camera image?

What is the function of a light pipe in nuclear medicine imaging?

Which of the following semiconductor materials is used in commercial intraoperative probes?

What is involved in calibrating a scintillation detector?

What is the percent energy resolution for a Cs137 source with an energy range at half-maximum from 625 keV to 692 keV?

What is the appropriate collimator if part of the body being imaged is larger than the collimator’s field of view?

What causes non-uniformity in a gamma camera?

What type(s) of radiation are being measured when a Geiger counter is used to measure a radioactive source with its cover removed?

According to the standard of practice, the percent energy resolution for Cs137 should fall between:

What is the region of operation on the voltage-response curve for an ionization survey meter?

Does pulse mode operation of a gas-filled detector require a high photon flux to produce an accurate reading?

What does the change in charge on one or both plates of a gas-filled detector correlate to?

Identify the region of operation on the voltage-response curve for a Geiger counter.

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