Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
41 Cards in this Set
- Front
- Back
|
The greater the number of xrays performed each week, the (greater, lesser) the
shielding required. |
greater
|
|
|
Proportional counters are the only radiation detection devices used for:
a. stationary instrument monitoring b. assay of radionuclides c. photospectroscopy d. imaging |
b. assay of radionuclides
|
|
|
Ionization chambers are the only radiation detection devices used for:
a. personnel monitoring b. imaging film c. survey for fields greater than 1 mR per hour d. portable instruments |
c. survey for fields greater than 1 mR per hour
|
|
|
25. Collimators (on fluoro units) must be adjusted so that the unexposed border is visible on the TV monitor when the image intensifier is positioned 35cm above the tabletop. TRUE or FALSE
|
TRUE
|
|
|
24. The cumulative timer will emit an audible signal when _____ minutes of fluoro
time have elapsed. |
5
|
|
|
23. Xray beam intensity at the fluoro tabletop should not exceed ___ per minute for each mA of operation at 80 kVp.
a. 1.2 R b. 2.1 R c. 1.2 mR d. 2.1 mR |
d. 2.1 mR
|
|
|
22. When the filtration is unknown, the _____ should be measured to access adequate filtration.
a. SID b. HVL |
b. HVL
|
|
|
21. The source to skin distance must be at least ____cm for stationary fluoro units,
And ____cm for mobile units. a. 38, 30 b. 30, 38 |
a. 38, 30
|
|
|
20. Linearity (output is constant though mA stations are varied) must not vary more
Than _____%. a. 5 b. 10 c. 15 d. 20 |
b. 10
|
|
|
19. Reproducibility (same exposure consistently) must not vary more than ___%.
a. 1 b. 3 c. 5 d. 7 |
c. 5
|
|
|
18. The bucky slot cover and the protective curtain must contain at least ___mm of lead.
a. 0.0025 b. 0.025 c. 0.25 d. 2.5 |
c. 0.25
|
|
|
17. Accuracy within 2% of the SID is necessary for the following:
a. Source to image receptor distance b. Collimation c. PBL d. All of the above |
d. All of the above
|
|
|
16. More shielding is required in a/an (controlled, uncontrolled) area.
|
uncontrolled
|
|
|
15. Detection devices operated in the pulse mode will chirp, tick or beep in the presence of radiation. TRUE or FALSE
|
TRUE
|
|
|
14. Which of the following are examples of gas filled detectors?
a. ionization counters b. Geiger Muller detectors c. Proportional counters d. All of the above |
d. All of the above
|
|
|
13. Control panels are required to have both visible and ______
Signals indicating exposure. |
audible
|
|
|
12. Which of the following chemicals function as the sensing material in a TLD?
a. calcium tungstate b. sodium iodide c. lithium fluoride d. barium sulfate |
c. lithium fluoride
|
|
|
11. Units of either mA-second/week or mA/minutes/week are used to determine the
___ for a specific room. a. workload b. use c. occupancy d. distance |
a. workload
|
|
|
10. What is the term for the proportional amount of time during which the xray beam
Is energized or directed toward a particular barrier? a. occupancy b. workload c. distance d. use |
d. use
|
|
|
9. Protective shielding for a controlled area must ensure that the exposure rate
remains below___mR per week. a. 1000 b. 100 c. 2 d. 10 |
b. 100
|
|
|
8. Factors affecting barrier thickness include:
a. distance between the source of radiation and the barrier b. the use of the area being protected c. the level of radiation activity and the penetrability of the xray beam d. all of the above |
d. all of the above
|
|
|
7. Scintillation detectors may be used in nuclear medicine or in CT scanners.
The scintillation process emits (heat, light) when ionizing radiation is absorbed. |
light
|
|
|
6. Which of the following may be used as primary shielding in radiography?
a. lead b. concrete c. gypsum board d. a and b |
d. a and b
|
|
|
5. Radiographers work primarily in a/an (controlled, uncontrolled) area.
|
controlled
|
|
|
4. A Geiger counter is used for:
a. dose estimation b. detection of radiation c. calibration of equipment d. radiation protection for the patient |
b. detection of radiation
|
|
|
3. The exposure limit of ___ is 100mR/hour at 1 meter from the source is for:
a. fluoro dose at the tabletop b. leakage radiation |
b. leakage radiation
|
|
|
2. Radiographers get most of their exposure during (general radiography, fluoro).
|
fluoro
|
|
|
1. In regard to shielding, which of the following would require primary barrier
shielding? a. chest board wall b. control booth wall c. ceiling d. floor |
a. chest board wall
|
|
|
intensity should not exceed _____ in angiography or cardiac cath modalities.
|
20R/min
|
|
|
DAP is a quantity that reflects not only the dose but also the ______ of tissue irradiated
a. mass b. density c. volume d. all the above |
c. volume
|
|
|
In the location of x-ray imaging system in the exam room the _________ is consulted.
|
Medical Physicist
|
|
|
Secondary Radiation
is _____ and _______ |
Scatter Radiation - patient
Leakage Radiation - unit |
|
|
Scatter at 1 meter from the patient is approximately ____ of the intensity of the useful beam at the patient.
|
0.10%
|
|
|
Controlled Area allows ____ mrem per year
|
5,000
100 mrem / week |
|
|
Uncontrolled Area allows ____ mrem per year
|
100
2 mrem / week uncontrolled is 2% of controlled |
|
|
Factors Affecting Barrier Thickness
Wall = use factor of ___ Floor = use factor of ___ |
Wall = use factor of ¼
Floor = use factor of 1 |
|
|
Exposures outside a room rarely exceed ____ of dose limits
|
1/10
|
|
|
Radiation Detection and Measurement:
Radionuclide assay = __________ |
Proportional counter
|
|
|
Radiation Detection and Measurement
Personnel monitors Film (photographic) = _____ |
Film (photographic) = 10mrem
|
|
|
Thermoluminescent dosimetry = _____
|
Thermoluminescent dosimetry = 5mrem
|
|
|
Optically stimulated dosimetry = _____
|
Optically stimulated dosimetry = 1mrem
|
