Exposure Equipment (8)

Question 1

Cassette

Answer 1

Contains a radiographic film sandwiched between two lead screens.
- loaded in a darkroom

Question 2

Clock Tape

Answer 2

• made of lead numbers sealed in a transparent tape
• affixed to a specimen using velcro
• used to identify sections of specimen in the radiograph

Question 3

Image Quality Indicators (IQI)

Answer 3

(Penetrameters)

• Indicate the quality and sensitivity of the radiograph
• made of same material as specimen
• specified by codes and standards

two types:

• plaque/hole type
• wire type

Question 4

Plaque/hole type IQI

Answer 4

• 2% of specimen thickness
• indicated in thousands of an inch
• (specimen thickness x 2%)

How to read:
- top hole diameter is 2x IQI thickness
(second number)
- mid hole diameter is 1x IQI thickness
- bottom hole diameter is 4x IQI thickness

place next to are being inspected on source side

Question 5

Wire type IQI

Answer 5

6-8 wires (depending on type), arranged in order of increasing diameter encapsulated between two clear vinyl sheets

• quality levels = hole type IQI

place on top of area being inspected on source side.

label:
material group #, wire set designation, largest wire #

date of invention, material type, # of wires

Question 6

Source guide tube positioning equipment

Answer 6

• bungee cords
• magnet stand (hazardous, restricts movement in emergencies)
• elliptical jig
• tape
• magnetic film holders

(only use equipment manufactured by a recognized supplier, no homemade)

Question 7

Bungee cords

Answer 7

most common means of securing

Question 8

Magnet stands

Answer 8

used for elliptical and superimposed

- use with caution

Question 9

Magnetic film holders

Answer 9

hold film in place if bungee cords aren’t practical, can also hole source guide tube in place

• paddle magnets (circular magnet housed in a durable high impact plastic flap)
• cheap and easy