Here Most Best Radiation Protection MCQs Part 11
“Explore in-depth Radiation Protection MCQs Part 11: Enhance your understanding of radiological safety through a comprehensive set of multiple-choice questions, designed to boost your expertise in radiation protection.”
1. Which is least likely to be categorized as an x-ray detector?
A. Ionization chamber
B. Scintillation detector
C. Geiger-Muller counter
D. Photostimulable phosphor
E. Photomultiplier tube
ANS:- E
2. Absorbed x-ray doses may be quantified by heating thermoluminescent dosimeters and measuring the emitted:
A. Radio waves
B. Microwaves
C. Infrared
D. Visible light
E. Ultraviolet
ANS:- D
3. When ionization chambers absorb x-rays, they most likely measure the resultant:
A. Charge
B. Heat
C. Light
D. Photons
D. Voltage
ANS:- A
4. Which of the following works on the principle of air ionization?
B. Thermoluminescent dosimeter
C. Photostimulable phosphor
E. Geiger counter
ANS:- E
5. Which dosimeter would likely be used when a parent holds a child for an x-ray examination?
A. Ionization chamber
B. Geiger counter
C. TLD
D. Film badge
E. Pocket dosimeter
ANS:- E
6. Who coordinates the radiation control programs in all 50 states in the United States?
A. CRCPD
B. ICRP
C. BEIR
D. NCRP
E. NRC
ANS:- A
7. The regulatory (2008) effective dose limit (mSv/year) for U.S. x-ray technologists is:
A. 1
B. 5
C. 10
D. 20
E. 50
ANS:- E
8. The regulatory (2008) effective dose limit (mSv) for a patient chest CT scan is:
A. 1
B. 5
C. 20
D. 50
E. No limit
ANS:- E
9. Regulatory dose limits for the public include only doses received from:
A. Dental radiographs
B. Airplane flight
C. Terrestrial radioactivity
D. Screening radiographs
E. Radiology cafeterias
ANS:- E
10. The regulatory (2008) dose limit (mSv/year) to a member of the public is:
A. 0.25
B. 0.5
C. 1
D. 2
E. 5
ANS:- C
11. Scattered radiation intensities at 1 m in diagnostic examination, expressed as a percentage (%) of the patient skin dose, is most likely:
A. 0.01
B. 0.03
C. 0.1
D. 0.3
E. 1
ANS:- C
12. Leakage radiation (mGy per hour) at 1 m from an x-ray tube must not exceed:
A. 0.01
B. 0.1
C. 1
D. 10
E. 100
ANS:- C
13. The transmission of x-rays (%) by a 0.5-mm Pb apron in diagnostic radiology is most likely:
A. 5
B. 15
C. 25
D. 35
E. 45
ANS:- A
14. Which is least likely to be required in designing the shielding for an x-ray room?
A. Beam filtration
B. Occupancy factor
C. Room dimensions
D. Use factor
E. Workload
ANS:- A
15. The annual effective dose (mSv) received by a nuclear medicine technologist is most likely:
A. 0.3
B. 1
C. 3
D. 10
E. 30
ANS:- C
16. If a radiologist were to increase the distance to a fluoroscopy patient from 1 to 2 m, his or her radiation dose would likely be:
A. 1/2
B. 1/3
C. 1/4
D. 1/5
E. 1/8
ANS:- C
17. Entrance skin dose (mGy) for an AP abdominal x-ray examination is most likely:
A. 0.1
B. 0.5
C. 2
D. 10
E. >10
ANS:- C
18. The patient exposure rate during fluoroscopy is least likely to be affected by the:
A. Exposure time
B. Grid ratio
C. Patient thickness
D. Tube current
E. Tube voltage
ANS:- A
19. The average glandular dose per film (mGy) in screening mammography is most likely:
A. 0.5
B. 1.5
C. 3
D. 5
E. 10
ANS:- B
20. The chance (%) that a patient undergoing an IR procedure in a radiology department will suffer a serious deterministic injury is likely:
A. 10
B. 1
C. 0.1
D. 0.01
E. 0.001
ANS:- D
21. Fetal doses in CT would likely be reduced with increasing:
A. Patient size
B. Tube voltage
C. Tube current
D. Scan time
E. Scan length
ANS:- A
22. The most likely patient effective dose (mSv) from a four-phase abdominal CT examination is most likely:
A. 5
B. 10
C. 25
D. 75
E. 150
ANS:- C
23. The benefit–risk ratio of screening mammography is most likely:
A. 2:1
B. 4:1
C. 8:1
D. 16:1
E. >16:1
ANS:- E
24. The average effective dose (mSv/year) from background radiation in the United States, excluding radon, is likely:
A. 0.1
B. 0.3
C. 1
D. 3
E. 10
ANS:- C
25. Which are the most damaging emissions from the decay of 222Rn (radon) and its daughters?
A. Alpha
B. Beta plus
C. Beta minus
D. Neutrino
E. Gamma ray
ANS:- A
26. The largest exposure to the U.S. population from man-made radiation is the result of:
A. A-bomb fallout
B. Diagnostic x-rays
C. Industrial radiography
D. Nuclear power plants
E. Nuclear waste sites
ANS:- B
27. The average effective dose to the U.S. population from diagnostic imaging in 2006 was most likely:
A. 0.5
B. 1
C. 2
D. 3
E. 5
ANS:- D
28. The average patient effective dose (mSv) in NM imaging (2006) was most likely:
A. 0.5
B. 1
C. 2.5
D. 5
E. 10
ANS:- E
29. The number of diagnostic x-ray examinations (millions) performed in the United States in 2006 was most likely:
A. 100
B. 250
C. 500
D. 1,000
E. 2,000
ANS:- C
30. The contribution (%) of medical imaging to the U.S. population dose from all man-made radiation exposure is most likely:
A. 50
B. 75
C. 90
D. 95
E. >95
ANS:- E
31. Mean exposure of radiation from pantamograph is
A. 90mR
B. 120mR
C. 250mR
D. 300mR
Ans. A
32. The maximum permissible dose of radiation to the operator of an x-ray machine is
A. 0.05 rem per year
B. 0.5 rem per year
C. 5.0 rem per year
D. 50 rem per year
Ans. C
33. The principal hazard to operator and patient is produced by what type of radiation
A. Gamma
B. Primary
C. Secondary
D. None of the above
Ans. C
34. Radiation produced from tube other than focal spot is called
A. Stray radiation
B. Scattered radiation
C. Characteristic radiation
D. Primary radiation
Ans. A
35. Major source of secondary scatteted radiation
A. Compton effect
B. Photoelectric effect
C. Thompson effect
D. All of the above
Ans. A
36. According to heel effect when cathode rays strike anode target, x-ray released with high intensity are found towards
A. Anode
B. Cathode
C. In between anode and cathode
D. None of the above
Ans. B
37. …………… is not a property of x rays
A. Ionisation
B. Action on photographic film
C. Excitation
D. Collimation
Ans. D
38. Commonly used collimating device
A. Aluminium filter
B. Lead diaphragm
C. Molybdenum cup
D. Tungsten filament
Ans. B
39. The x-ray collimators commonly used in dentistry include the following except
A. Diaphragm collimator
B. Tubular collimator
C. Rectangular collimator
D. Square collimator
Ans. D
40. Greatest decrease in overall radiation risk from dental x-ray to patients is achieved by
A. Using speed E film
B. Rectangular collimation
C. Using a lead apron
D. Increasing target film distance
Ans. B
41. The three forms of ionizing radiation are:
A. Microwave, alpha, beta
B. Visible light, x-ray, gamma
C. Gamma, alpha, beta
D. X-ray, laser, microwave
ANS:- C
42. What percentage of radiation exposure comes from background radiation?
A. 80%
B. 20%
C. 50%
D. 5%
ANS:- A
43. Gamma radiation can be shielded with:
A. Paper
B. Your skin
C. Aluminum
D. Lead
ANS:- D
44. What is the effective dose limit for a non-nuclear energy worker?
A. 3 miliseiverts per year
B. 1 milisievert per year
C. 20 miliseiverts per year
D. None of the above
ANS:- B
45. What type of radiation does Phosphorus-32 release?
A. Alpha
B. Beta
C. Gamma
D. X-ray
ANS:- B
46. Radioactivity unit is:
A. Rem or Sievert
B. Microcurie or Becquerel
C. Kilovolt or Megavolt
D. None of the above
ANS:- B
47. A GM detector is used to detect:
A. Alpha
B. Beta
C. Gamma
D. All of the above
ANS:- D
48. To protect yourself from the internal radiation exposure, you should:
A. NOT eat and drink in the lab
B. NOT store empty cups/containers/utensils in the lab or near radioactive materials
C. NOT store food and/or drink in the lab
D. All of the above
ANS:- D
49. The three best ways to protect yourself from radiation exposures are:
A. Time, distance, shielding
B. Meditate, focus, breathe
C. Paper, plastic, lead
D. Distance, ear-plugs, shielding
ANS:- A
50. The effects of short-term exposures to high radiation could cause:
A. Tissue damages
B. Inhibit tissue functions
C. Unrepairable tissue damages
D. All of the above
ANS:- D
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