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.

Accepted Answer

D

Question 2

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

Accepted Answer

C-arm devices with similar fields of view typically have dose rates to personnel located within a meter of the patient that are comparable to that of routine fluoroscopy.

Question 3

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

Accepted Answer

The radiologic technologist should be allowed to continue her employment and perform her duties without interruption as long as she has received radiation safety counseling and follows established radiation safety practices. It is not necessary to prohibit her from performing radiologic procedures during her pregnancy, as long as she takes measures to protect herself and her fetus from radiation exposure. Terminating her employment or requiring her to take a leave of absence without a valid reason would be discriminatory and illegal.

Question 4

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

Accepted Answer

During fluoroscopy and special procedures, the radiographer is exposed to a higher amount of radiation and should always wear a thyroid shield to protect the thyroid gland from radiation exposure.

Question 5

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

Accepted Answer

The answer of Diagnostic imaging personnel receive the highest occupational...

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?

Accepted Answer

According to the inverse square law, intensity is inversely proportional to the square of the distance. If the distance is tripled (i.e., increased by a factor of 3), the intensity will decrease by a factor of 3^2, or 9. Therefore, the correct answer is C.

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.

Accepted Answer

The genetically significant dose is a measure of the potential genetic impact of radiation exposure on future generations. It is calculated by estimating the average gonadal dose received by a population and multiplying it by the number of individuals in that population. Occupational exposure can be kept low through protective measures but may still result in a higher equivalent dose than the general population. However, this increased dose should not significantly affect the genetically significant dose, as it is based on the average dose for a population rather than individual doses. Therefore, B is the best choice as it directly addresses the concept of genetic impact and is not affected by the occupational exposure of individual workers.

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?

Accepted Answer

The answer of If the peak energy of the x-ray...

Question 9

Whenever scattered radiation decreases,the radiographer's exposure:

Accepted Answer

Scattered radiation is radiation that has been deflected from its original path in the patient and travels in different directions. It contributes to the radiographer's exposure and can lead to unnecessary radiation exposure. When scattered radiation decreases, the radiographer's exposure also decreases. Therefore, the correct answer is A.

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

Accepted Answer

The answer of Which of the following x-ray procedures increases...

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 ____________________.

Accepted Answer

The answer of While standing behind the control-booth barrier,a radiographer...

Question 12

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

Accepted Answer

The answer of Which part(s) of a diagnostic x-ray unit...

Question 13

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

Accepted Answer

The answer of Which of the following is another term...

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.

Accepted Answer

According to the International Atomic Energy Agency (IAEA), the annual effective dose limit for individual members of the general population not occupationally exposed is 1 mSv for continuous or frequent exposures from artificial sources other than medical irradiation and natural background, and 5 mSv for infrequent annual exposure. Choice A matches these values. Choices B, C, and D do not match the IAEA limits.

Question 15

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

Accepted Answer

The answer of The maximum weekly permitted equivalent dose for...

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?

Accepted Answer

The term for the proportional amount of time during which the x-ray beam is energized or directed toward a particular barrier is called the use factor. The occupancy factor refers to the portion of time when people are present in the area being shielded. The workload factor pertains to the amount of radiation produced by the x-ray machine, while the distance factor is the inverse square of the distance between the radiation source and the barrier.

Question 17

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

Accepted Answer

The answer of Which of the following adjustments in technical...

Question 18

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

Accepted Answer

When the time spent in a higher radiation area is reduced or limited, the occupational exposure is also reduced. This is because the radiation dose received by a person is directly proportional to the amount of time they spend in an area with higher radiation levels. Therefore, if the time spent in such an area is reduced or limited, the dose received will also be reduced.

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?

Accepted Answer

The purpose of a spot film device protective curtain or sliding panel is to intercept scattered radiation above the tabletop, which is the type of radiation that can reach the fluoroscopist and increase their radiation exposure. Primary radiation and direct radiation are typically intercepted by other types of shielding such as the lead apron, and exit or image formation radiation travels in the opposite direction of the fluoroscopist.

Question 20

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

Accepted Answer

Radiography is considered a relatively safe occupation compared to extremely hazardous industries or nuclear-related events. However, it still carries some risk, and safety measures should be taken to minimize exposure to radiation. Other industries such as government and trade are also considered reasonably safe.

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