29 Questions
What term describes the time interval that must elapse after detection of an ionizing particle before a second particle can be detected?
Resolving Time
Which term is used to measure the ionization of air in a Geiger tube?
Count Rate
What is the term for the minimum time at which a gas-filled detector recovers enough to start another avalanche (pulse)?
Dead Time
What can 'dead time losses' become severe in gas-filled detectors?
Limited Processes in the Detector
How can the observed count rate be corrected for dead time in some systems like GM detectors?
$R_C = (1 - R_0) \times T$
Which parameter measures the ionization of air in a Geiger tube?
Exposure
What is a characteristic of Geiger tube ionizations in relation to energy?
They are a constant for a specific energy but vary with energy level.
At what photon energy does the response of a compensated Geiger meter reach a maximum?
60 keV
How does the compensation sheath in a Geiger meter affect lower photon energies?
It decreases the detection rate at lower energies.
In what energy range does the compensated response of a Geiger meter show independence of energy?
50 keV to 1.25 MeV
How do compensation sheaths influence an instrument's directional response?
They improve the directional response.
What do compensation sheaths prevent from reaching the Geiger tube in a GM detector?
Beta particles and very low energy photons
What scintillator has the lowest density among the listed commonly used scintillators?
Plastics
Which scintillator has a decay constant of 0.3 ms?
BGO
Which scintillator has an emission maximum at 350 nm?
YAP (Ce)
What scintillator is slightly hygroscopic and has a refractive index of 1.84?
CsI(Na)
Which scintillator is the most dense among the listed commonly used scintillators?
CdWO4
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?
YAP (Ce)
What technology does the RadEye PRD use to achieve its high sensitivity?
Natural Background Rejection (NBR)
Which component of the RadEye G allows for dose rate measurement of gamma and x-ray radiation?
Large Energy Compensated GM Tube
What is the main feature of the RadEye G in terms of its linearity over different radiation intensities?
Linearity over 5 decades of radiation intensity
Which RadEye model is capable of suppressing alarms caused by variations in natural background?
RadEye PRD
What unique feature does the RadEye PRD possess compared to typical electronic dosimeters?
$10^5$ times more sensitivity
What is the maximum radiation intensity level that the RadEye G can indicate an overrange condition for?
$1000$ R/h
What material is known for having very high light output and good energy resolution?
NaI(Tl)
Which material is characterized by being non-hygroscopic, rugged, and emitting long wavelength light?
CsI(Na)
What material is specifically used for thermal neutron detection and spectroscopy due to its high neutron cross-section?
6LiI(Eu)
Which material is ideal for DC measurement of X-rays due to its very high density and low afterglow properties?
CdWO4
What is a common application of cesium iodide (CsI(Tl)) that is thinly machined and can be bent into various shapes?
Beta detection
Learn about the characteristics and considerations for gas-filled detectors in radiation measurement, such as high range detection, alpha/beta detection, dose rate, shield requirements, power supply needs, calibration frequency, and issues like dead time. Explore factors affecting their stability and performance.
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