Source and Film Positioning (7)

Question 1

Ideally the direction of the radiation beam should be _____ to the main axis of a part.

Answer 1

Perpendicular

Question 2

Describe the section thickness ratio:

Answer 2

• reduce the thickness ration with source angulation

Question 3

Tubular section categories

Answer 3

• small (0-20mm)
• medium (20-40mm)
• large (>40mm)

Question 4

Small pipes require how many exposures?

Answer 4

1

Question 5

Medium pipes require how many exposure?

Answer 5

2, 90° to one another

Question 6

Large pipes require how many exposures?

Answer 6

3 at 120° to one another

or

4 at 90° to one another

Question 7

It is always desired that the area of the part under inspection is as ___ as possible to the film.

Answer 7

close

Question 8

Film should ideally be ____ against the part under inspection.

Answer 8

flat, intimate, touching

Question 9

Pipe exposures can be separated into categories:

Answer 9

• single or double wall exposure
• single or double wall view
• multiple films or single film

Question 10

Describe a panoramic/center-shot

Answer 10

Source centred inside pipe, multiple film wrapped around exterior of pipe, formed to pipe shape.

Question 11

Describe a shadow shot

Answer 11

Source at distance from pipe on exterior, single film on opposing exterior side, not formed to pipe shape.

Question 12

Describe a superimposed shot

Answer 12

three exposures, 60-120° of one another, projecting one wall over another.

Question 13

Describe an elliptical exposure

Answer 13

source is of set to the angle of a weld plane for double wall, double view exposure.

• source is at a 15-30° plane
• ring shape image
• often require 2 90° to one another shots

Question 14

Describe contact exposures

Answer 14

source is as close/touching the part under inspection with film on opposing exterior side of part.

• double wall, single view contact exposures