BDA radiography and radiology Exam
Questions and Answers
Question 1
What's direct action film?
Correct Answer
Intra oral film. Only sensitive to xray photons
Question 2
What's indirect action film
Correct Answer
Extra oral with intensifying screen & cassette . sensitive to light photons
Question 3
Why is direct action film used for intra oral
Correct Answer
For excellent image quality
Question 4
black paper is used on either side of the film to protect the film from...?
Correct Answer
Light
damage by fingers
saliva that may leak into film packet
Page 1 of 11
, Question 5
Why is a thin sheet of lead foil placed behind the film?
Correct Answer
To stop residual radiation going further into pt tissues
To stop secondary radiation from scattering back onto film and degrading the
image
If film was placed wrong way in pts mouth the lead foil would show on radiograph
making the fault easily identified
Question 6
Increasing the Ma will make the image
Correct Answer
too dark/blacken
Question 7
Decreasing the mA will make the image
Correct Answer
Too white / light
Question 8
What % of energy is conducted as heat and X-rays ?
Correct Answer
Heat -99%
Xrays - 1%
Question 9
What is the recommended FSD
Correct Answer
200mm or 20cm
Page 2 of 11
Questions and Answers
Question 1
What's direct action film?
Correct Answer
Intra oral film. Only sensitive to xray photons
Question 2
What's indirect action film
Correct Answer
Extra oral with intensifying screen & cassette . sensitive to light photons
Question 3
Why is direct action film used for intra oral
Correct Answer
For excellent image quality
Question 4
black paper is used on either side of the film to protect the film from...?
Correct Answer
Light
damage by fingers
saliva that may leak into film packet
Page 1 of 11
, Question 5
Why is a thin sheet of lead foil placed behind the film?
Correct Answer
To stop residual radiation going further into pt tissues
To stop secondary radiation from scattering back onto film and degrading the
image
If film was placed wrong way in pts mouth the lead foil would show on radiograph
making the fault easily identified
Question 6
Increasing the Ma will make the image
Correct Answer
too dark/blacken
Question 7
Decreasing the mA will make the image
Correct Answer
Too white / light
Question 8
What % of energy is conducted as heat and X-rays ?
Correct Answer
Heat -99%
Xrays - 1%
Question 9
What is the recommended FSD
Correct Answer
200mm or 20cm
Page 2 of 11
