Deck 13: Management of Imaging Personnel Radiation Dose During Diagnostic X-Ray Procedures

Question 1

When doors to radiographic and fluoroscopic rooms are closed during radiation exposures,a substantial degree of protection is provided for persons in areas adjacent to the room door.This is because in most facilities room doors have attenuation for diagnostic energy x-ray equivalent to that provided by _______ mm of lead.

A) 0.2
B) 0.4
C) 0.6
D) 0.8

Answer 1

0.8

Question 2

For C-arm devices with similar fields of view,the dose rate to personnel located within a meter of the patient is:

A) comparable to that of routine fluoroscopy.
B) far greater than the dose rate of routine fluoroscopy.
C) significantly less than the dose rate of routine fluoroscopy.
D) comparable to that of high-level-control fluoroscopy.

Answer 2

comparable to that of routine fluoroscopy.

Question 3

When a radiologic technologist declares her pregnancy to her employer,which of the following is appropriate?

A) Her employer terminates her employment until after her child is born.
B) She is able to continue her employment but is not permitted to perform any radiologic procedures during the remainder of her pregnancy.
C) Her employer requires her to take a leave of absence until after the completion of the first trimester of the pregnancy and then return to her normal duties.
D) She continues to perform her duties without interruption of employment, provided that she has received radiation safety counseling and follows established radiation safety practices.

Answer 3

She continues to perform her duties without interruption of employment, provided that she has received radiation safety counseling and follows established radiation safety practices.

Question 4

During which of the following x-ray examinations should a radiographer always wear a thyroid shield?

A) Fluoroscopy and special procedures
B) Routine mobile radiographic procedures
C) General diagnostic radiographic procedures performed in an x-ray room
D) Digital radiography procedures and computed radiography procedures

Question 5

Diagnostic imaging personnel receive the highest occupational exposure during which of the following procedures?
1)Fluoroscopy
2)Mobile radiography
3)Special procedures

A) 1 only
B) 2 only
C) 3 only
D) 1, 2, and 3

Question 6

If the intensity of the x-ray beam is inversely proportional to the square of the distance from the source,how does the intensity of the x-ray beam change when the distance from the source of radiation and a measurement point is tripled?

A) It increases by a factor of 3 at the new distance.
B) It increases by a factor of 9 at the new distance.
C) It decreases by a factor of 9 at the new distance.
D) It decreases by a factor of 3 at the new distance.

Question 7

Because occupational exposure of the radiographer can be kept as low as reasonably achievable (ALARA) through individual monitoring and other protective measures and the use of protective devices and because exposure from radiation-related jobs will not alter the ______________________,radiation workers may receive a larger equivalent dose than members of the general population.

A) mean glandular dose
B) genetically significant dose
C) bone marrow dose
D) tissue tolerance dose

Question 8

If the peak energy of the x-ray beam is 100 kVp,a protective lead apron must be the equivalent to at least which of the following measures?

A) 0.25-mm thickness of lead
B) 0.5-mm thickness of lead
C) 1.0-mm thickness of lead
D) 1.5-mm thickness of lead

Question 9

Whenever scattered radiation decreases,the radiographer's exposure:

A) decreases.
B) increases slightly.
C) increases considerably.
D) remains the same.

Question 10

Which of the following x-ray procedures increases the radiographer's risk of exposure to ionizing radiation?
1)Mobile C-arm fluoroscopy
2)Interventional procedures that use high-level-control fluoroscopy
3)Mobile radiographic examinations

A) 1 and 2 only
B) 1 and 3 only
C) 2 and 3 only
D) 1, 2, and 3

Question 11

While standing behind the control-booth barrier,a radiographer makes a radiographic exposure.The x-rays scattered from the patient's body should ____________________.

A) not have enough energy remaining that will reach behind the control-booth barrier.
B) scatter only once before reaching any area behind the control-booth barrier.
C) scatter a minimum of two times before reaching any area behind the control-booth barrier.
D) scatter a minimum of 10 times before reaching any area behind the control-booth barrier.

Question 12

Which part(s) of a diagnostic x-ray unit should a radiographer avoid touching while a radiographic exposure is in progress?

A) Control panel
B) Exposure switch
C) Kilovoltage control on the control panel
D) Tube housing, collimator, and high-tension cables

Question 13

Which of the following is another term for use factor (U)?

A) Workload factor
B) Occupancy factor in controlled and uncontrolled areas
C) Beam direction factor
D) Protective barrier thickness consideration factor

Question 14

The annual effective dose limit for individual members of the general population not occupationally exposed is ___________ for continuous or frequent exposures from artificial sources other than medical irradiation and natural background and ____________ for infrequent annual exposure.

A) 1 mSv, 5 mSv
B) 3 mSv, 7 mSv
C) 5 mSv, 9 mSv
D) 50 mSv, 25 mSv

Question 15

The maximum weekly permitted equivalent dose for a controlled area must not exceed:

A) 1 millisievert.
B) 100 millisievert.
C) 20 microsievert.
D) 2 microsievert.

Question 16

What is the term for the proportional amount of time during which the x-ray beam is energized or directed toward a particular barrier?

A) Occupancy factor
B) Workload factor
C) Distance factor
D) Use factor

Question 17

Which of the following adjustments in technical exposure factors decreases the production of scattered radiation?

A) Decrease kVp and increase mAs in compensation
B) Decrease kVp and decrease mAs
C) Increase kVp and decrease mAs in compensation
D) Increase kVp and increase mAs

Question 18

When the time spent in a higher radiation area is reduced or limited,occupational exposure:

A) is also reduced.
B) is increased slightly.
C) remains the same.
D) is increased considerably.

Question 19

A spot film device protective curtain,or sliding panel,of a minimum thickness of 0.25-mm lead equivalent should normally be positioned between the fluoroscopist and the patient to intercept which of the following types of radiation?

A) Primary radiation
B) Scattered radiation above the tabletop
C) Exit or image formation radiation
D) Direct radiation

Question 20

In terms of occupational risk,radiography may be compared with the occupational risk associated with which of the following?

A) Extremely hazardous industries
B) Other industries considered reasonably safe, such as government and trade
C) A nuclear war
D) A radiation accident, such as the Chernobyl nuclear power plant disaster

Question 21

Secondary radiation includes:
1)leakage radiation.
2)primary radiation.
3)scatter radiation.

A) 1 and 2 only
B) 1 and 3 only
C) 2 and 3 only
D) 1, 2, and 3

Question 22

Who should determine the exact shielding requirements for a particular imaging facility?

A) Administrator of the facility
B) Medical physicist
C) Radiologist
D) Radiographer

Question 23

_______________ is the radiation output weighted time that the unit is actually delivering radiation during the week.

A) Control designation
B) Occupancy
C) Use factor
D) Workload

Question 24

To ensure that the lifetime risk of occupationally exposed persons remains acceptable,the lifetime effective dose in mSv should not exceed:

A) the occupationally exposed person's age in years.
B) 5 times the occupationally exposed person's age in years.
C) 10 times the occupationally exposed person's age in years.
D) 20 times the occupationally exposed person's age in years.

Question 25

Protective eyeglasses with optically clear lenses should contain a minimal lead equivalent protection of:

A) 0.15 mm.
B) 0.25 mm.
C) 0.35 mm.
D) 0.50 mm.