Chapter 15 RADBIO

A protective curtain, or sliding panel, with a minimum 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?

• Primary radiation

• Scattered radiation above the tabletop

• Exit or image-formation radiation

• Direct radiation

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?

• 0.25-mm thickness of lead

• 0.5-mm thickness of lead

• 1.0-mm thickness of lead

• 1.5-mm thickness of lead

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. Therefore, because exposure from radiation-related jobs will not alter the ______________________, radiation workers may receive a larger equivalent dose than members of the general population.

• mean glandular dose

• genetically significant dose

• bone marrow dose

• tissue tolerance dose

Scattered radiation to the lens of the eyes of diagnostic imaging personnel can be substantially reduced by the use of protective eyeglasses fitted with optically clear lenses that contain a minimal lead equivalent protection level of

• 0.001 mm.

• 0.05 mm.

• 0.35 mm.

• 1.50 mm.

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.

• 1 mSv; 5 mSv

• 3 mSv; 7 mSv

• 5 mSv; 9 mSv

• 50 mSv; 25 mSv

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

• 1 mSv.

• 100 mSv.

• 20 mSv.

• 2 mSv.

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

• 5 times the occupationally exposed person’s age in years.

• the occupationally exposed person’s age in years.

• 10 times the occupationally exposed person’s age in years.

• 20 times the occupationally exposed person’s age in years.

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

• She is able to continue her employment but is not permitted to perform any radiologic procedures during the remainder of her pregnancy.

• The employer terminates her employment until after her child is born.

• The 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.

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

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.

• 0.4

• 0.2

• 0.6

• 0.8

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

• is also reduced.

• is increased slightly.

• remains the same.

• is increased considerably.