Radiation Protection

Question 1

Radiographs are prescribed on an ________ basis.

Answer 1

individual

Question 2

Inherent filtration

Answer 2

.5 to 1 mm aluminum disc covering the glass

Question 3

The 2.5 mm aluminum filters (added filtration) removes which type of wavelength, short or long?

Answer 3

removes long wavelengths

Question 4

PA law requires that collimators restrict the size of the x-ray beam at the surface of the patient skin to….

Answer 4

2.75 inches in diameter

Question 5

Leakage radiation

Answer 5

any radiation emitted from the dental tubehead (not the primary beam)

Question 6

The patients lead apron should contain at least what amount of lead?

Answer 6

at least 0.25mm of lead or lead equivalent

Question 7

What is the purpose of the thyroid collar?

Answer 7

protects the highly radiosensitive tissues of the thyroid gland from scatter radiation

Question 8

During exposure, what type of film is most recommended?

Answer 8

Speed F (EF) Instant film
or digital imaging

Question 9

What is the function of the XCP receptor holder?

Answer 9

prevents unnecessary exposure by aiding in alignment in receptor, thus avoiding retakes

Question 10

At least how many feet away should the operator be from the tubehead?

Answer 10

6 feet (or use lead barrier)

Question 11

What angle should the operator position themselves to the primary beam

Answer 11

perpendicular
90 to 135 degree angle to beam

Question 12

List examples of protective shielding/barriers

Answer 12

-cement block walls
-leaded glass windows
-lead lined doors

Question 13

Describe how radiation monitoring is handled

Answer 13

-film badge worn at waist level
-worn for a month
-sent to service for analysis
-reports sent monthly
-operator NEVER wears when being personally exposed

Question 14

Radiation Control for Health and Safety Act

Answer 14

FEDERAL
1968
to standardize performance of x-ray equipment

Question 15

Consumer-Patient Radiation Health and Safety Act

Answer 15

FEDERAL
1981
addresses education and certification of persons using radiographic equipment

Question 16

What does MPD mean

Answer 16

maximum permissible dose
NCRP defines as maximum dose equivalent that a body is permitted to receive in a specific period of time with little or no injury

Question 17

MPD for occupationally exposed person

Answer 17

50 mSv/year or 5.0 rem/year

Question 18

MPD for non-occupationally exposed person

Answer 18

1 mSv/year or 0.1 rem/year

Question 19

MPD for occupationally exposed pregnant woman

Answer 19

0.5 mSv/per month during pregnancy (0.05 rem/mo)

Question 20

How is maximum accumulated dose (MAD) calculated?

Answer 20

MAD= age x 10 mSv

Question 21

ALARA

Answer 21

As Low As Reasonably Achievable
*concept that addresses keeping exposure to radiation at a minimum

Question 22

Who is the NCRP

Answer 22

National Council on Radiation Protection and Measurements