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BDA DENTAL RADIOGRAPHY
EXAM 2026/2027 ACTUAL
QUESTIONS WITH VERIFIED
ANSWERS.
What are X-rays classified as in terms of radiation? - ANSWER-
X-rays are classified as ionising radiation.
What is the difference between X-rays and gamma rays? -
ANSWER-Gamma rays are naturally occurring, while X-rays
are man-made.
What are the four main ways X-ray photons can interact with
matter? - ANSWER-1. Transmission - pass through matter
without interaction. 2. Absorption - all energy is absorbed by
matter.
3. Absorption and Scatter - deflected with energy loss.
4. Pure Scatter - deflected with no energy loss.
What are tissue reaction effects in the context of ionising
radiation? - ANSWER-Tissue reaction effects (somatic,
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deterministic effects) result from high doses of radiation, where
the severity of damage is proportional to the dose.
What are stochastic effects of ionising radiation? - ANSWER-
Stochastic effects are chance effects that can occur from any
dose of radiation, with severity not related to the dose. A single
X-ray photon can potentially cause fatal cancer.
What is the main aim of radiation protection in dental
radiography? - ANSWER-To completely prevent deterministic
effects and limit the chances of stochastic effects to an
acceptable level.
What is the nature of X-rays? - ANSWER-X-rays are packets of
energy called photons that travel in straight lines and can travel
in a vacuum.
How do X-rays interact with film emulsion? - ANSWER-X-rays
can blacken film emulsion to create an image.
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What is the significance of the phrase 'there is no such thing as
a safe dose of radiation'? - ANSWER-It emphasizes that any
exposure to radiation carries some level of risk.
What are the characteristics of X-ray photons? - ANSWER-X-
ray photons have a short wavelength and high energy,
originating and interacting at the atomic level.
What are the genetic effects of ionising radiation? - ANSWER-
Genetic effects occur in reproductive cells (egg and sperm) and
may affect future offspring.
What is the relationship between radiation dose and stochastic
effects? - ANSWER-Increasing the radiation dose increases the
chance of stochastic damage occurring.
What is the significance of the term 'ionising radiation'? -
ANSWER-Ionising radiation has enough energy to remove
tightly bound electrons from atoms, which can lead to tissue
damage.
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What is the potential risk associated with a single X-ray
photon? - ANSWER-Although very unlikely, it has the potential
to cause fatal cancer.
What is the role of physical methods in radiation protection? -
ANSWER-Physical methods are used to reduce the level of risk
involved with radiation exposure.
What is the nature of photons in the electromagnetic spectrum?
- ANSWER-Photons come in a wide range of energies, with
very low energy making up radio waves and medium energy
visible as light.
What is the importance of understanding atomic interactions in
X-ray production? - ANSWER-Understanding atomic
interactions is crucial for explaining how X-rays are produced.
What are the basic features of dental X-ray generating
equipment? - ANSWER-Dental X-ray equipment includes
components like the tubehead, X-ray tube, step-up transformer,
oil for heat removal, and a spacer cone for aiming the beam.
BDA DENTAL RADIOGRAPHY
EXAM 2026/2027 ACTUAL
QUESTIONS WITH VERIFIED
ANSWERS.
What are X-rays classified as in terms of radiation? - ANSWER-
X-rays are classified as ionising radiation.
What is the difference between X-rays and gamma rays? -
ANSWER-Gamma rays are naturally occurring, while X-rays
are man-made.
What are the four main ways X-ray photons can interact with
matter? - ANSWER-1. Transmission - pass through matter
without interaction. 2. Absorption - all energy is absorbed by
matter.
3. Absorption and Scatter - deflected with energy loss.
4. Pure Scatter - deflected with no energy loss.
What are tissue reaction effects in the context of ionising
radiation? - ANSWER-Tissue reaction effects (somatic,
,2 | Page
deterministic effects) result from high doses of radiation, where
the severity of damage is proportional to the dose.
What are stochastic effects of ionising radiation? - ANSWER-
Stochastic effects are chance effects that can occur from any
dose of radiation, with severity not related to the dose. A single
X-ray photon can potentially cause fatal cancer.
What is the main aim of radiation protection in dental
radiography? - ANSWER-To completely prevent deterministic
effects and limit the chances of stochastic effects to an
acceptable level.
What is the nature of X-rays? - ANSWER-X-rays are packets of
energy called photons that travel in straight lines and can travel
in a vacuum.
How do X-rays interact with film emulsion? - ANSWER-X-rays
can blacken film emulsion to create an image.
,3 | Page
What is the significance of the phrase 'there is no such thing as
a safe dose of radiation'? - ANSWER-It emphasizes that any
exposure to radiation carries some level of risk.
What are the characteristics of X-ray photons? - ANSWER-X-
ray photons have a short wavelength and high energy,
originating and interacting at the atomic level.
What are the genetic effects of ionising radiation? - ANSWER-
Genetic effects occur in reproductive cells (egg and sperm) and
may affect future offspring.
What is the relationship between radiation dose and stochastic
effects? - ANSWER-Increasing the radiation dose increases the
chance of stochastic damage occurring.
What is the significance of the term 'ionising radiation'? -
ANSWER-Ionising radiation has enough energy to remove
tightly bound electrons from atoms, which can lead to tissue
damage.
, 4 | Page
What is the potential risk associated with a single X-ray
photon? - ANSWER-Although very unlikely, it has the potential
to cause fatal cancer.
What is the role of physical methods in radiation protection? -
ANSWER-Physical methods are used to reduce the level of risk
involved with radiation exposure.
What is the nature of photons in the electromagnetic spectrum?
- ANSWER-Photons come in a wide range of energies, with
very low energy making up radio waves and medium energy
visible as light.
What is the importance of understanding atomic interactions in
X-ray production? - ANSWER-Understanding atomic
interactions is crucial for explaining how X-rays are produced.
What are the basic features of dental X-ray generating
equipment? - ANSWER-Dental X-ray equipment includes
components like the tubehead, X-ray tube, step-up transformer,
oil for heat removal, and a spacer cone for aiming the beam.
