Theory of Operation for Gas Filled Detectors

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What factors affect the pulse size in gas filled detectors?

Medium between the source and detector, source strength, distance from the source

Type of radiation, energy of radiation, source strength

Applied voltage, distance from the source, type of gas

Energy of radiation, applied voltage, type of gas (correct)

What happens to the pulse magnitude with higher ionizing radiation?

It decreases due to recombination of ion pairs

It increases due to higher applied voltage (correct)

It decreases due to higher applied voltage

It increases due to recombination of ion pairs

What is added to the gas in a gas filled detector to prevent continuous discharge inside the detector?

Absorbing filters

Quenching materials (correct)

Thermal insulation materials

Aperture collimators

What region is characterized by a transitional region to the Geiger-Mueller region in a gas filled detector?

Proportional region Signup and view all the answers

What increases the pulse or current seen on the output of a gas filled detector?

Higher energy level of measured radiation Signup and view all the answers

What happens when the ionization in a gas filled detector occurs but some ion pairs recombine before reaching the electrodes?

Decreased sensitivity of the detector Signup and view all the answers

What is a key advantage of using an ionization chamber for dose rate measurements?

Output signal is directly proportional to the amount of radiation entering the detector Signup and view all the answers

What is a limitation of generally using ionization chamber detectors?

Inability to detect radiation levels above 100,000 dpm Signup and view all the answers

What should be done if the count rate exceeds 50,000 ncpm when frisking with a pancake GM detector?

Determine if the count rate rapidly drops when the probe is moved away from the centerline geometry Signup and view all the answers

What is a procedure for handling a discrete radioactive particle (DRP) found during frisking?

Attempt to remove the DRP using tape and repeat frisking after each attempt Signup and view all the answers

What should be done to verify if a radioactive particle has been isolated with tape?

Frisk the tape with a pancake GM detector Signup and view all the answers

Why are ionization chambers less sensitive to low radiation levels compared to other detectors?

Cannot amplify gas within the chamber Signup and view all the answers

What is the criteria for verifying a smeared location to be posted as an Alpha Level 2 or 3 Area?

If 𝛽𝛾 𝑑𝑝𝑚 ≤ 30,000 and 𝛼𝑎𝑐𝑡𝑖𝑣𝑖𝑡𝑦 ≥ 20 Signup and view all the answers

What is the threshold criteria for verifying an alpha frisker to be available and post as require alpha frisking?

If 𝛼 100cm^2 ≤ 300 and 𝛽γ 𝑑𝑝𝑚 ≥ 20 Signup and view all the answers

Theory of Operation for Gas Filled Detectors

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Questions and Answers

What factors affect the pulse size in gas filled detectors?

What happens to the pulse magnitude with higher ionizing radiation?

What is added to the gas in a gas filled detector to prevent continuous discharge inside the detector?

What region is characterized by a transitional region to the Geiger-Mueller region in a gas filled detector?

What increases the pulse or current seen on the output of a gas filled detector?

What happens when the ionization in a gas filled detector occurs but some ion pairs recombine before reaching the electrodes?

What is a key advantage of using an ionization chamber for dose rate measurements?

What is a limitation of generally using ionization chamber detectors?

What should be done if the count rate exceeds 50,000 ncpm when frisking with a pancake GM detector?

What is a procedure for handling a discrete radioactive particle (DRP) found during frisking?

What should be done to verify if a radioactive particle has been isolated with tape?

Why are ionization chambers less sensitive to low radiation levels compared to other detectors?

What is the criteria for verifying a smeared location to be posted as an Alpha Level 2 or 3 Area?

What is the threshold criteria for verifying an alpha frisker to be available and post as require alpha frisking?

What should be done if the βγ/α Ratio is greater than 30,000 or between 30,000-300?

What type of electrodes are utilized in Self-Reading Pocket Dosimeters (SRPD)?

What happens to the charge as the ion chamber in the SRPD is ionized?

What instrument is proportional to the dose received in an ion chamber?

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