Self Test: Part G

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1

What is the SI unit of radiation measurement for absorbed dose?

Gray

2

Which term is replacing "exposure" to describe skin dose?

Air kerma

3

What is the annual whole body effective dose (ED) for a technologist?

50 mSv or 5 rem

4

What is the cumulative lifetime ED for a 25 year old technologist?

250 mSv

5

What is the annual ED limit for an individual younger than 18 years of age?

1 mSv or 0.1 rem

6

The federal set maximum limit on exposure rates for intensified fluoroscopy units is:

10 R/minutes

7

For most modern equipment, the average fluoroscopy tabletop exposure rate is:

1 and 3 R/minutes

8

What is the primary purpose of x-ray tube filtration?

Absorb lower (unusable) energy x-rays

9

Which of the following results in the highest ED for females (assuming no specific area shields are used)?

AP thoracic spine (14 X 17 inch collimation)

10

The use of a 1-mm lead equivalent gonadal shield reduces the gonadal dose by _________ if the gonads are within the primary x-ray field.

50% - 90%

11

Which type of shield is ideal when the affected tissue is part of a sterile field?

Shadow shield

12

True/False:

Low kV and high mAs techniques greatly reduce patient dose compared with high kV and low mAs techniques.

False

13

True/False:

The total ED for females on an AP chest projection is more than double for that of a PA chest.

True

14

True/False:

The use of a positive beam limiting (PBL) collimator is no longer required by the FDA for new x-ray equipment manufactured after 1994.

True

15

True/False:

Collimators must be accurate within 5% of the selected SID.

False

16

Which of the following is not one of the cardinal principles of radiation protection?

Distance

Time

Shielding

Collimation

Collimation

17

Which one of the following changes will best reduce patient dose?

Decrease kV and increase mAs

Increase kV and lower mAs

Using a grid

Increase mAs and lower kV

Increase kV and lower mAs

18

Where is the safest place for the technologist to stand during a fluoroscopic procedure?

behind the radiologist

19

Which of the following protection devices must be employed during a fluoroscopic procedure?

Bucky slot shield

Lead gloves

Compensating filter

Restraining devices

Bucky slot shield

20

The ED for a pregnant technologist per month is:

0.5 mSv (0.05 rem)

21

True/False:

A fetal personnel dosimeter is worn at the level of the waist by a pregnant technologist during fluoroscopy.

True

22

True/False:

All administrative staff in the radiology department must wear a personnel dosimeter even if not involved with patient care directly.

False

23

True/False:

The ICRP and ARC have determined that the "10-day rule" is obsolete for procedures of the abdomen and pelvis.

True

24

True/False:

ALARA does not apply to digital imaging.

False

25

True/False:

Using a different algorithm to process an overexposed CR image is an acceptable and ethical practice.

False