2024-2025

Question 1

In an intra oral X-ray photons are produced at the

Answer 1

Tungsten target

Question 2

In an intra oral X-ray set what is the purpose of the aluminium filler

Answer 2

Preferentially attenuate low energy x rays

Question 3

In an intra oral X-ray set what is the purpose of the collimator

Answer 3

Restrict X-ray beam to chosen area

Question 4

In an intra oral X-ray set the high tension (voltage) circuit

Answer 4

Is in the 65-70 kVp range

Question 5

Compton (inelastic) scatter

Answer 5

Reduces contrast in an image

Question 6

The mA current setting on an intra oral X-ray set

Answer 6

Controls the number of electrons produced at the filament

Question 7

In an intra oral X-ray set excess heat is

Answer 7

All of the above

Question 8

Rectangular collimation

Answer 8

Reduces the patient - dose by around 40%

Question 9

The stochastic effects of ionising radiation

Answer 9

Occur as the result of chance events

Question 10

Which statement is true with regards to the paralleling intra oral technique

Answer 10

It enables the beam to be centred to the film

Question 11

Collimation of the X-ray beam

Answer 11

Should be rectangular

Question 12

The deterministic or non stochastic effects of ionising radiation

Answer 12

Are dose dependent

Question 13

The X-ray beam should be

Answer 13

Perpendicular to the tooth and image receptor to prevent distortion

Question 14

The risk of developing cancer from low doses of ionising radiation

Answer 14

Follows the linear no threshold model

Question 15

The Frankfort baseline is

Answer 15

A radiographic plane that extends from the external auditory meatus to the infra orbital margin

Question 16

The national diagnostic reference dose for intra oral radiology is approximately 2.0mGy
What is this is expressed in terms of

Answer 16

Absorbed dose

Question 17

An X-ray of a female patient of child bearing age

Answer 17

Must be undertaken in accordance with local written procedures

Question 18

Under IRMER optimisation ensure that the

Answer 18

Dose is as low as achievable and image quality is acceptable

Question 19

Under IRMER

Answer 19

The operator must have practical training

Question 20

Regarding justification

Answer 20

Justification must be carried out for every exposure

Question 21

Regarding justification the

Answer 21

Practitioner is responsible for justifying the exposure

Question 22

The ionising radiation (medical exposure) regulations 2017

Answer 22

Are intended to protect patients

Question 23

What do the ionising radiations regulations 2017 require

Answer 23

All exposures to be restricted as far as reasonably practicable

Question 24

Members of staff should

Answer 24

Inform her employer in writing if they believe they are pregnant

Question 25

Concerning controlled areas

Answer 25

Are subject to written arrangements to control access

Question 26

The radiation protection supervisor (RPS)

Answer 26

Must have received appropriate training

Question 27

The role of the radiation protection supervisor is to

Answer 27

Ensure that local rules are being followed and enforced

Question 28

The absorbed dose at the cone for a mandibular molar radiograph is approximately

Answer 28

2 mGy

Question 29

Bremsstrahlung or ‘braking radiation’ is

Answer 29

The major source of photons in X-ray tube

Question 30

The useful interaction of photons with matter when taking intra oral X-rays is

Answer 30

Photo electric absorption

Question 31

What is a diagnostic reference level (DRL)

Answer 31

Is the radiation dose which should not be normally exceeded for a standard exposure

Question 32

Beam collimators should provide a minimum focus to skin distance (FSD) of

Answer 32

200mm

Question 33

Intra oral radiography equipment should operate within which tube potential range

Answer 33

60 - 70 kV

Question 34

X-ray production in a diagnostic X-ray tube is approximately how efficient

Answer 34

1%

Question 35

How far away from the dental X-ray tube does the controlled area extend

Answer 35

As defined in the local rules

Question 36

Regarding the photoelectric effect

Answer 36

The incident photon is completely absorbed

Question 37

Regarding effective dose, it

Answer 37

Expresses the probability of cancer incidence in a population

Question 38

Regarding absorbed dose

Answer 38

Absorbed dose is a measure of the energy deposited in tissue per unit mass

Question 39

Regarding the Bremsstrahlung (braking radiation) process

Answer 39

An incident electron interacts with the nucleus releasing an X-ray photon

Question 40

Image unsharpness is not affected by

Answer 40

Increase in kVp

Question 41

Patient dose is not affected by

Answer 41

Using a rotating anode target

Question 42

Dose optimisation is the process by which

Answer 42

A diagnostically relevant image is obtained at the lowest dose

Question 43

The minimum legal filtration for a dental X-ray set (up to 70kVp) is

Answer 43

1.5mm Al

Question 44

Deterministic effects of ionising radiation

Answer 44

Have a threshold dose below which they do not occur

Question 45

Stochastic radiation effects

Answer 45

Are assumed to follow a linear no threshold relationship to dose

Question 46

Compton or inelastic scattering

Answer 46

Is the most likely source of radiation exposure to an operator

Question 47

The X-ray beam should be collimated to

Answer 47

Limit extraneous radiation that does not play a part in the imagining process

Question 48

Equivalent dose is the

Answer 48

Absorbed dose to an organ or tissue weighted for type of radiation

Question 49

The health and safety executive

Answer 49

All of the above

Question 50

Which of the following is not required in the local rules

Answer 50

An exposure chart containing both local and national diagnostic reference levels