Test 2

Question 1

What is lead equivalency for lead aprons and when are they checked

Answer 1

.5mm pb is preferred .25 if .5 is not an option

Checked upon acceptance and every year

Question 2

When is environmental inspection done

Answer 2

Annually

Question 3

Types of radiation measurements

Answer 3

Ion chamber
     •pocket Ion Chamber
     •analog/digital dosimeter
Proportional counter
     • used in labs to measure radioactive material
Geiger-Müller counter
    •contamination control in NM

Question 4

Performance testing evaluates….

Answer 4

Performance of xray generator and tube by using phantoms, test tools, and computerized testing

Question 5

What does reproducibly of exposure measure? What is acceptable limits? How often is it checked

Answer 5

Measurement of the same tech factors over time
+/- 5%
✔️on acceptance and annually

Question 6

What is radiation output testing? Acceptable limits

Answer 6

Output of generators

+/- 10% room to room consistency

Question 7

Acceptable limits of filtration

Answer 7

2.5 above 70kvp

Question 8

What are two ways to check kvp? Acceptable limits? How often is it checked

Answer 8

Wisconsin test cassette and digital KVP meter
+/- 5%
On acceptance and annually

Question 9

What are acceptable limits for timer accuracy

Answer 9

+/- 5% on time greater than 10 msec

+/- 20% on time less than. 10 msec

Question 10

What is the only way to test the timer accuracy for a single phase generator and what does it look like

Answer 10

Spinning top

Dots

Question 11

Name other ways to check timer accuracy on all other generators (not single phase)

Answer 11

Synchronous/motor driven spinning top create an arch that is measured with a protractor
Oscilloscope visualized waveform

Question 12

What is the mA reciprocity linearity lest and what are the limits

Answer 12

Should produce the same exposure w any combination of the same mAs.
+/- 10%

Question 13

What is linearity

Answer 13

Sequential increase in exposure as mAs is increased

+//10%

Question 14

If focal spot is not consistence what may it cause

Answer 14

Focal spot blooming (penumbra)

Question 15

What are three ways to test focal spot

Answer 15

Pinhole camera made of gold platinum alloy
Focal spot test tool
️resolution chart

Question 16

Line focal principal

Answer 16

Smaller the angle the smaller the effective and better the ️resolution

Question 17

How to test mean restriction how often and acceptable limits

Answer 17

Collimator test tool
8/9 penny test
+/- 2% of SID
✔️every 6 months

Question 18

What is beam alignment? Took used? Acceptable range

Answer 18

X-ray tube mounted in housing correctly
Beam alignment test tool
1° of perpendicularity

Question 19

What is the acceptable limit for xray beam and Bucky tray alignment

Answer 19

Center of Bucky and beam must be aligned w/I 1% of the SID

Question 20

SID is checked with what?

Answer 20

Tape measure

+/- 2%

Question 21

What is used to check AEC consistency with part ️thickness? Acceptable limits

Answer 21

Acrylic blocks
+/- .2 OD
30% pixel value

Question 22

Acceptable levels for ️AEC and varying field sizes

Answer 22

+/- .1 OD

Question 23

What are acceptable limits of OD when testing the consistancy of ️AEC detectors

Answer 23

+/- .2 or 30%

Question 24

Back up timer

Answer 24

600 mAs

6 sec

Question 25

How do you test grid? Acceptable limits? When do you test?

Answer 25

Use a grid alignment tool
Check each quadrant
+/- 10% or .1 OD
✔️ on acceptance and annually

Question 26

Anode heel effect causes more intensity at the _______ end of the tube

Answer 26

Cathode

Question 27

What are 3 parts of QC for rad units

Answer 27

Visual inspection
Environment inspection
Performance testing