Protection of Personnel Week 2

Question 1

What is the xray tube enclosed in?

Answer 1

lead-lined metal covering requiring 1/16 inch lead

Question 2

Leakage radiation from the xray tube housing should not exceed what parameters?

Answer 2

100mR/hr within a distance of 1 meter from the tube

Question 3

Factors that help determine required barrier thickness

Answer 3

Occupancy, workload, and use

Question 4

Radiation survey instruments

Answer 4

Geiger-Muller and cutie pie meter

Question 5

Area occupied by radiology personnel and patients

Answer 5

Controlled Area

Question 6

Radiation in the Controlled area cannot exceed

Answer 6

100 mRem/week

Question 7

Area occupied by the general public

Answer 7

Uncontrolled area

Question 8

Radiation in the uncontrolled area cannot exceed

Answer 8

1mgy/yr

Question 9

Barrier perpendicular to the xray beam and are designed to withstand the strength of a full primary radiation

Answer 9

Primary Barrier

Question 10

Requirements of Primary Barriers

Answer 10

1/16 inch lead, 7 ft tall

Question 11

Minimum requirement for filtration on x-ray equipment operating above 70 kVp

Answer 11

2.5 mm AL

Question 12

Barriers around the room designed to absorb scatter radiation

Answer 12

Secondary barriers

Question 13

Requirement of secondary barriers

Answer 13

1/32 inch lead

Question 14

Thickness of material required to reduce the intensity of a xray or gamma ray beam to one half of its initial value

Answer 14

Half Value Layer (HVL)

Question 15

Thickness of lead apron

Answer 15

0.25 mm lead

Question 16

Thickness of lead gloves

Answer 16

0.25 mm lead

Question 17

Thickness of thyroid shield

Answer 17

0.5 mm lead

Question 18

Thickness of lead glasses

Answer 18

0.35 mm lead

Question 19

The intensity of radiation at a given distance from a point source is inversely proportional to the square of the distance of the object from the source

Answer 19

Inverse Square Law

Question 20

If we double the distance from the source, what happens to the intensity?

Answer 20

Intensity of new distance is 1/4 as much as the original intensity

Question 21

How to adjust for involuntary motion of patients

Answer 21

Use a high mA and short exposure time