Board Prep- Rad Safety

Question 1

What reduces patient dose, improves image quality, & reduces scatter production?

Answer 1

Beam Restriction

Question 2

The NCRP regulations state manual collimators must be w/in __% of the SID.

Answer 2

2

Question 3

The purpose of ___ is to reduce patient skin dose.

Answer 3

Filtration

Question 4

The NCRP regulations state equipment operating above 70 kV must have total minimum of __ mm/Al equivalent.

Answer 4

2.5

Question 5

A grid w/ a ratio of __ is recommended for exams using more than 100 kV.

Answer 5

16:1

Question 6

What principle is demonstrated: when testing mA stations & keeping constant exposure time, twice the mAs should produce twice the exposure.

Answer 6

Linearity

Question 7

What is the annual occupational exposure dose-equivalent limit?

Answer 7

50 mSv

Question 8

Undertable bucky slot covers in fluoroscopic rooms require at least the equivalent of __ available.

Answer 8

0.25mm/pb

Question 9

What type of radiation barrier are the lead walls and doors in an imaging room?

Answer 9

Primary radiation barrier

Question 10

The leaded glass shield in the control booth should contain __ equivalent.

Answer 10

1.5mm pb

Question 11

What are the cardinal principles of radiation protection?

Answer 11

Time, Distance, and Shielding

Question 12

The NCRP regulations state SSD should not be less than __ for all procedures other than dental radiography.

Answer 12

12 inches

Question 13

The equivalent of traditional unit rem is the ___ in the SI.

Answer 13

Sievert

Question 14

A TLD can measure radiation doses as low as __ mrem.

Answer 14

5

Question 15

1 Gy equals __ rad.

Answer 15

100

Question 16

The annual dose limit of the general population is __ mSv per year.

Answer 16

5

Question 17

The cumulative exposure for an occupationally exposed individual who is 40 years old must not exceed __ mSv.

Answer 17

400

Question 18

For pregnant radiographers, the gestational dose limit to the fetus during the gestational period must not exceed __ mSv.

Answer 18

5

Question 19

What interaction with matter contributes to quantum mottle in an x-ray image?

Answer 19

Compton Scatter

Question 20

An atom containing 6 protons and 6 neutrons in it’s nucleus has an atomic number of what?

Answer 20

6

Question 21

Secondary radiation barriers must contain a minimum thickness of __ pb equivalent.

Answer 21

1/32 inches

Question 22

If linear energy transfer (LET) increases, what effect occurs on relative biologic effectiveness (RBE)?

Answer 22

It also increases (direct relationship)

Question 23

If a male patient experiences sterility after excessive radiation exposure to the gonads, they are experiencing what type of radiation effect?

Answer 23

Local somatic

Question 24

Of the following, which is NOT considered a short-term somatic effect: epilation, erythema, cataracts, & epistaxis.

Answer 24

Cataracts

Question 25

When a minimum amt of radiation is required to produce a predetermined response, the dose response relationship is what?

Answer 25

threshold

Question 26

What is the maximum exposure rate per minute at the surface of the table top for a conventional fluoroscopic unit?

Answer 26

10 c/kg

Question 27

What is the term used for radiation effects that are limited to the exposed population only?

Answer 27

Somatic effects

Question 28

What is the active component of a thermoluminescent radiation monitoring device?

Answer 28

lithium fluoride

Question 29

During which trimester is the developing fetus considered to be at it’s greatest period of radioresistance?

Answer 29

The third trimester

Question 30

What is the prescribed distance used when measuring leakage radiation for the housing of a diagnostic x-ray tube?

Answer 30

1 meter