Basic Principles (3)

Question 1

What is exposed during a radiograph?

Answer 1

The article being tested and the film.

Question 2

Factors that determine exposure time include:

Answer 2

• Energy and intensity of radiation
• Thickness and density of test article
• Source to film distance
• Independent film variables (film speed, required film density etc.)

Question 3

Techniques used to produce radiographs using x-rays vs gamma rays are _____.

Answer 3

similar, main differences being the source of radiation and the ability/non-ability to control the energy and intensity of the beam.

Question 4

List Exposure Factors

Answer 4

• Source-to-film distance
• alignment of beam
• geometrical imaging factors
• type of film

Question 5

Differences between x-ray and gamma ray equipment

Answer 5

Generation: x-ray = electric, gamma = disintegration

Control of energy: x-ray = adjust kV, gamma = characteristic of isotope

Control of intensity: x-ray = adjust mA, gamma = characteristic of isotope

Question 6

The radiographers main objective should be obtaining a radiographic image of the specimen with the greatest amount of ______.

Answer 6

Detail

Question 7

Always use an energy that is as ____ as _____.

Answer 7

as Low as Practical

Question 8

Why do we desire lower intensities of radiation for radiographs?

Answer 8

lower energies produce radiographs of higher definition and contrast.

Question 9

If we can’t control energy and intensity of gamma radiation, what can we do to improve a radiograph?

Answer 9

slight adjustments to controllable variables:

• film selection
• source to film distance
• use of film screens

Question 10

Gamma rays produce somewhat _____ radiation.

Answer 10

Harder radiation.

- images of slightly lesser resolution