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Rad Protection Ch 4

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1.
1 point
Ion chambers have a wide range of radiation intensities ranging from ___________________
2.
1 point
The TLD Phosphor LiF can measure as low as ________
3.
1 point
An ion chamber used to measure the output of x-ray machines or gamma source.
4.
1 point
Which mode detects individual ionization events?
5.
1 point
With a large gas filled chamber, the device will be ____________
6.
1 point
As the voltage increases beyond the proportional region, the amplitude of the output signal begins to "level off." This is true about what voltage stage?
7.
1 point
What is true about proportional counters?
8.
1 point
This measures radiation intensities around fluoroscopy, radionuclide generators, syringes, and outside protective barriers.
9.
1 point
The _____________ of the electrical signal coming from an ion chamber can be increased as the voltage in the chamber increases
10.
1 point
This counter is most commonly used in nuclear medicine to measure small quantities of radioactive materials.
11.
1 point
Voltage stage ranging from 100 to 300 volts.
12.
1 point
G-M counters have a narrow sensitivity range, being limited to _________________
13.
1 point
As a radiaiton beam passes through the gas filled chamber, atoms of the gas become ______________________
14.
1 point
Scintillation detectors are less accurate than a G-M counter
15.
1 point
Heat sensitivity, moisture sensitivity, and can not measure below 10 mR are all drawbacks to __________
16.
1 point
_______________ is controlled by the electronic circuitry in the gas-filled device and the chamber voltage
17.
1 point
The minimum time between ionizations that can be detected on a geiger counter
18.
1 point
Limited range, energy dependent, and overly sensitive are all characteristics of ____________
19.
1 point
A few substances called phosphors can emit visible light when heat is applied. This is called
20.
1 point
The voltage range of a proportional counter is _________
21.
1 point
Accuracy is the same as sensitivity
22.
1 point
Certain substances will emit visible light when irradiated. This is called ___________
23.
1 point
List the 2 most common scintillation phosphors used
24.
1 point
Uses of scintillation detectors in diagnostic radiography include:
25.
1 point
Which mode detects the accumulative dose over a period of time?
26.
1 point
The ionization of a specific volume of gas by the radiation beam is the basis of operation for all __________ devices
27.
1 point
Which mode detects ionization events per unit of time?
28.
1 point
_______________is the most common phosphor used in TLD
29.
1 point
When ion pairs in chamber recombine resulting in no electrons being attracted to the central electrode and no voltage is the ____________
30.
1 point
What are the 3 types of gas filled radiation detectors?
31.
1 point
The anions are attracted to the positive central electrode while the cations are attracted to the negatively charged chamber wall. The realignment of these ions within the chamber is creates ____________, which is amplified and moved to a read out device.
32.
1 point
With scintillation, The amount of light emitted is unproportional to the amount of radiaition absorbed by the material.
33.
1 point
Ion chambers are also referred to as _________
34.
1 point
The most common gas used in gas filled devices is _________
35.
1 point
In what voltage stage is the ionizing chamber completely discharged rendering the instrument useless.
36.
1 point
What are the categories of detection and measurement instruments?
37.
1 point
Other common TLD phosphors include:
38.
1 point
Recombination region, ion chamber region, proportional region, geiger-muller region, and continuous discharge region are all
39.
1 point
_________________ is/are added to the gas of the chamber to enable the chamber to return to its original condition.
40.
1 point
A GM counter may not be able to recognize sequential ionizing events if the chamber is not restored to its original condition
41.
1 point
______________ was the first radiation detection device and was introduced in the 1940's
42.
1 point
LiF has an atomic number of 8.2, resembling The x-ray absorption property of _________
43.
1 point
An ion chamber other than R-meter used in diagnostic x-ray is _________
44.
1 point
Radiation detection instruments are designed to:
45.
1 point
The rigid wire in the center of the chamber in a gas filled device is called _____________ and is connected to a power supply and assumes a positive charge while the walls of the cylinder become negative.
46.
1 point
______________ are used for radioactive contamination control in nuclear medicine labs.
47.
1 point
In a gas-filled device, the ion intensity is _________ proportional to the intensity of the radiation beam
48.
1 point
In a __________ counter, the electrons in the chamber move toward the electrode at such a high speed that a secondary wave of electrons is released, causing a rapid and proportional increase in strength of the output signal.
49.
1 point
Radiation detection instruments operate in what 3 modes?
50.
1 point
The scintillation phosphors convert radiation energy into visible light, which is converted to electricity
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