BDA Radiography and Radiology Exam
2025/2026 | Actual Exam with Complete
Questions | British Dental Association |
Dental Radiography Certification
What's direct action film? -CORRECTANSWER Intra oral film. Only sensitive to xray
photons
What's indirect action film -CORRECTANSWER Extra oral with intensifying screen &
cassette . sensitive to light photons
Why is direct action film used for intra oral -CORRECTANSWER For excellent image
quality
black paper is used on either side of the film to protect the film from...? -
CORRECTANSWER Light
damage by fingers
saliva that may leak into film packet
Why is a thin sheet of lead foil placed behind the film? -CORRECTANSWER 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
Increasing the Ma will make the image -CORRECTANSWER too dark/blacken
Decreasing the mA will make the image -CORRECTANSWER Too white / light
What % of energy is conducted as heat and X-rays ? -CORRECTANSWER Heat -99%
Xrays - 1%
What is the recommended FSD -CORRECTANSWER 200mm or 20cm
What are the dose units used for radiography -CORRECTANSWER Radiation absorbed
dose
Equivalent dose
Effective dose
What dose is the actual dose patients are interested in? -CORRECTANSWER Effective
dose
What is the effective dose from one intra oral radiograph ? -CORRECTANSWER
0.022&0.0003 millisievert msv
2025/2026 | Actual Exam with Complete
Questions | British Dental Association |
Dental Radiography Certification
What's direct action film? -CORRECTANSWER Intra oral film. Only sensitive to xray
photons
What's indirect action film -CORRECTANSWER Extra oral with intensifying screen &
cassette . sensitive to light photons
Why is direct action film used for intra oral -CORRECTANSWER For excellent image
quality
black paper is used on either side of the film to protect the film from...? -
CORRECTANSWER Light
damage by fingers
saliva that may leak into film packet
Why is a thin sheet of lead foil placed behind the film? -CORRECTANSWER 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
Increasing the Ma will make the image -CORRECTANSWER too dark/blacken
Decreasing the mA will make the image -CORRECTANSWER Too white / light
What % of energy is conducted as heat and X-rays ? -CORRECTANSWER Heat -99%
Xrays - 1%
What is the recommended FSD -CORRECTANSWER 200mm or 20cm
What are the dose units used for radiography -CORRECTANSWER Radiation absorbed
dose
Equivalent dose
Effective dose
What dose is the actual dose patients are interested in? -CORRECTANSWER Effective
dose
What is the effective dose from one intra oral radiograph ? -CORRECTANSWER
0.022&0.0003 millisievert msv
