Theory of Operation for Gas Filled Detectors
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Questions and Answers

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?

    <p>Proportional region</p> Signup and view all the answers

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

    <p>Higher energy level of measured radiation</p> 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?

    <p>Decreased sensitivity of the detector</p> Signup and view all the answers

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

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

    What is a limitation of generally using ionization chamber detectors?

    <p>Inability to detect radiation levels above 100,000 dpm</p> 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?

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

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

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

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

    <p>Frisk the tape with a pancake GM detector</p> Signup and view all the answers

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

    <p>Cannot amplify gas within the chamber</p> 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?

    <p>If 𝛽𝛾 𝑑𝑝𝑚 ≤ 30,000 and 𝛼𝑎𝑐𝑡𝑖𝑣𝑖𝑡𝑦 ≥ 20</p> 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?

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

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

    <p>Initiate an investigation</p> Signup and view all the answers

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

    <p>Fiber electrometer and metal frame</p> Signup and view all the answers

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

    <p>Decreases on the movable and fixed fiber</p> Signup and view all the answers

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

    <p>Movement of the fiber</p> Signup and view all the answers

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