Other (1)

Question 1

Factors that affect the type of energy chosen for a radiographic inspection

Answer 1

Material:

• type
• density
• thickness
• location
• code or standard requirements
• available equipment

Question 2

What is a DMF?

Answer 2

Dose Modification Factors - A deterministic value applied when calculating the equivalent dose of radiation

Influencing factors:

• relative organism radiosensitivity
• physical factors (of radiation)
• chemical factors (oxygen, water etc.)
• biological factors (DNA, age, growth phase)

Question 3

What is a log and antilog?

Answer 3

log of a number is the power (exponent) to which the number 10 must be raised to give the original number.

10 x 10 = 100 = log of 2
10 x 10 x 10 = 1000 = log of 3

Question 4

When are logs important?

Answer 4

when determining;

• radiation safety and exposure control calculations (time, distance, shielding)
• constructing exposure charts
• using film characteristic curves to correct exposure times

Question 5

What is the other name for a characteristic curve?

Answer 5

D log E curve

density is plotted against logarithms of exposure

Question 6

What is Reciprocity?

Answer 6

Reciprocity Law or Bunsen-Roscoe Law, both mA and time can be changed in order to keep exposure a constant.

Question 7

What is an Exposure Factor?

Answer 7

The relationship between exposure and the distance of a radioactive source to the film.