Gas-filled Detectors in Radiation Measurement
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Questions and Answers

What term describes the time interval that must elapse after detection of an ionizing particle before a second particle can be detected?

  • Resolving Time (correct)
  • Dead Time
  • Recovery Time
  • Calibration Time

    • Which term is used to measure the ionization of air in a Geiger tube?

  • Exposure Time
  • Recovery Time
  • Count Rate (correct)
  • Pulse Height

    • What is the term for the minimum time at which a gas-filled detector recovers enough to start another avalanche (pulse)?

  • Calibration Time
  • Dead Time (correct)
  • Resolving Time
  • Recovery Time

    • What can 'dead time losses' become severe in gas-filled detectors?

    <p>Limited Processes in the Detector</p> Signup and view all the answers

    How can the observed count rate be corrected for dead time in some systems like GM detectors?

    <p>$R_C = (1 - R_0) \times T$</p> Signup and view all the answers

    Which parameter measures the ionization of air in a Geiger tube?

    <p>Exposure</p> Signup and view all the answers

    What is a characteristic of Geiger tube ionizations in relation to energy?

    <p>They are a constant for a specific energy but vary with energy level.</p> Signup and view all the answers

    At what photon energy does the response of a compensated Geiger meter reach a maximum?

    <p>60 keV</p> Signup and view all the answers

    How does the compensation sheath in a Geiger meter affect lower photon energies?

    <p>It decreases the detection rate at lower energies.</p> Signup and view all the answers

    In what energy range does the compensated response of a Geiger meter show independence of energy?

    <p>50 keV to 1.25 MeV</p> Signup and view all the answers

    How do compensation sheaths influence an instrument's directional response?

    <p>They improve the directional response.</p> Signup and view all the answers

    What do compensation sheaths prevent from reaching the Geiger tube in a GM detector?

    <p>Beta particles and very low energy photons</p> Signup and view all the answers

    What scintillator has the lowest density among the listed commonly used scintillators?

    <p>Plastics</p> Signup and view all the answers

    Which scintillator has a decay constant of 0.3 ms?

    <p>BGO</p> Signup and view all the answers

    Which scintillator has an emission maximum at 350 nm?

    <p>YAP (Ce)</p> Signup and view all the answers

    What scintillator is slightly hygroscopic and has a refractive index of 1.84?

    <p>CsI(Na)</p> Signup and view all the answers

    Which scintillator is the most dense among the listed commonly used scintillators?

    <p>CdWO4</p> Signup and view all the answers

    What scintillator has a conversion efficiency of 35 - 40 for room temperature gamma rays when coupled to a photomultiplier tube with a Bi-Alkalai photocathode?

    <p>YAP (Ce)</p> Signup and view all the answers

    What technology does the RadEye PRD use to achieve its high sensitivity?

    <p>Natural Background Rejection (NBR)</p> Signup and view all the answers

    Which component of the RadEye G allows for dose rate measurement of gamma and x-ray radiation?

    <p>Large Energy Compensated GM Tube</p> Signup and view all the answers

    What is the main feature of the RadEye G in terms of its linearity over different radiation intensities?

    <p>Linearity over 5 decades of radiation intensity</p> Signup and view all the answers

    Which RadEye model is capable of suppressing alarms caused by variations in natural background?

    <p>RadEye PRD</p> Signup and view all the answers

    What unique feature does the RadEye PRD possess compared to typical electronic dosimeters?

    <p>$10^5$ times more sensitivity</p> Signup and view all the answers

    What is the maximum radiation intensity level that the RadEye G can indicate an overrange condition for?

    <p>$1000$ R/h</p> Signup and view all the answers

    What material is known for having very high light output and good energy resolution?

    <p>NaI(Tl)</p> Signup and view all the answers

    Which material is characterized by being non-hygroscopic, rugged, and emitting long wavelength light?

    <p>CsI(Na)</p> Signup and view all the answers

    What material is specifically used for thermal neutron detection and spectroscopy due to its high neutron cross-section?

    <p>6LiI(Eu)</p> Signup and view all the answers

    Which material is ideal for DC measurement of X-rays due to its very high density and low afterglow properties?

    <p>CdWO4</p> Signup and view all the answers

    What is a common application of cesium iodide (CsI(Tl)) that is thinly machined and can be bent into various shapes?

    <p>Beta detection</p> Signup and view all the answers

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