radiography

Question 1

The collective term for best describing the black, white and grey shadowing on a developed xray are better known as…..

Answer 1

Contrast

Question 2

What type of radiation is used in dentistry?

Answer 2

Ionising Radiation

Question 3

When we talk about Z in Radiation, what do we mean ?

Answer 3

The number of Protons (+) In the nucleus of an atom

Question 4

The nucleus is made up of what?

Answer 4

Neutrons (no charge) and protons (+)

Question 5

What is the process known as removing an electron (-) from an atom?

Answer 5

Ionisation

Question 6

The closest shell to the nucleus is known as the what?

Answer 6

K Shell

Question 7

What does the focusing device do in the x-ray tube?

Answer 7

It aims the stream of electrons (-) at the focal spot of the target

Question 8

When does heat producing collisions take place?

Answer 8

When an incoming electron collides with an outer shell

Question 9

Continuous spectrum happens when?

Answer 9

the xray electron passes close to the nucleus of the atom

Question 10

What is attenuation in relation to xrays striking matter?

Answer 10

Absorption and scatter

Question 11

When electrons (-) bombard the target, What percentage of xrays produced?

Answer 11

1%

Question 12

What is the radiation absorbed dose?

Answer 12

The measure of the amount of energy absorbed from the radiation beam per unit mass of tissue

Question 13

What is the background radiation estimated at approximately?

Answer 13

2.7 mSv

Question 14

Deterministic effects will happen if….?

Answer 14

….the body is exposed to a high dose of radiation

Question 15

The photoelectric effect is described as…?

Answer 15

Pure absorption with low energy photons

Question 16

A step down transformer is used for what….?

Answer 16

Changes the incoming mains voltage from 240v to a low voltage current required to heat the filament

Question 17

What is indirect action to cells within the body?

Answer 17

Involves the breakdown of water molecules

Question 18

Fatal radiation induced malignancy from a BW xray in adults- What is the risk?

Answer 18

1 in 20000000

Question 19

What is a spacer cone also known as?

Answer 19

beam indicating device

Question 20

What is a direct action radiographic film?

Answer 20

is sensitive primarily to xray photons

Question 21

What does the lead foil do in a xray film packet?

Answer 21

prevents scattered radiation

Question 22

Calcium tungstate screeens are sensitive to what coloured light?

Answer 22

Blue

Question 23

In chemical processing the silver halide crystals are converted to what colour metallic silver in the development stage?

Answer 23

Black

Question 24

In this instance in chemical processing the temperature of the developer is 20 oC, how long should the film be immersed for?

Answer 24

5 minutes

Question 25

The Ionising Radiations Regulations 2017......

Answer 25

Came into force on 1st January 2018

Question 26

The Ionising Radiation (medical exposure) Regulations 2018 states that....

Answer 26

the practitioner must justify an exposure

Question 27

Non classified workers in relation to radiation, their dose per year should not exceed

Answer 27

6mSv a year

Question 28

Radiolucency on a radiography will show as....?

Answer 28

completely Black

Question 29

What is and advantage of using the bisecting angle technique?

Answer 29

is quick and simple to use

Question 30

When taking a BW xray the tubehead should be positioned....?

Answer 30

5-8o downwards

Question 31

What is and advantage of using BW holder?

Answer 31

the image receptor is held firmly in position and cannot be displaced by the tongue

Question 32

What is an upper standard occlusal radiograph used to?

Answer 32

detecting unerupted canines or supernumeries

Question 33

cephalometric radiographs.....

Answer 33

Can be used in orthognathic surgery planning

Question 34

In dental panoramic tomography.....

Answer 34

The focal trough is horseshoe shaped

Question 35

When positioning a patient for DPT the patient should....

Answer 35

Keep their spine straight

Question 36

A main advantage of using DPT is....

Answer 36

compared to full mouth survey using intraoral films it is about 1/5 the radiation dose

Question 37

A too dark image is caused by.....

Answer 37

being overdeveloped

Question 38

Images that are unsharp/blurred could be caused by?

Answer 38

film packet being excessively bent

Question 39

Where do you find cervical burn out?

Answer 39

at the neck of the tooth. (not to be mixed up with root caries)

Question 40

What is the correct colour of mop and bucket to clean a surgery floor?

Answer 40

yellow

Question 41

How many hours of eCPD do you need to complete in a 5 year cycle?

Answer 41

50

Question 42

How many principles are there in the GDC standards? 5,6,7,8,9

Answer 42

9

Question 43

What has a target?

Answer 43

Anode

Question 44

A photon charge is...?

Answer 44

nil

Question 45

What is Z?

Answer 45

the atomic number

Question 46

What is removed from an inner to an outer shell to cause excitation?

Answer 46

electron

Question 47

braking radiation is also known as...?

Answer 47

continuous spectrum

Question 48

electrons jumping from one energy shell to another and emits xray photons is called..?

Answer 48

characteristic spectrum

Question 49

energy below 69.5 kV is known as what?

Answer 49

characteristic k line

Question 50

Which is the fastest intensifying screen?

Answer 50

rare earth

Question 51

Which states xray equipment having to have a light, audible warning when exposing xray?

Answer 51

Ionising radiation regulations

Question 52

Who is responsible for overall safety of staff when using radiation?

Answer 52

radiation protection supervisor

Question 53

Which clarifies the positions of responsibility regarding employer, referrer and operator?

Answer 53

Ionising radiation (medical exposure) regulations

Question 54

what should be kept by all xray machines?

Answer 54

local rules

Question 55

what should be used by all staff taking more than 100 intraoral or 50 extraoral xrays a year?

Answer 55

personal monitoring

Question 56

All patients should be treatment using....?

Answer 56

safety glasses/spectacles

Question 57

What should not be used when opening film packets?

Answer 57

powdered gloves

Question 58

how should pts be seated when taking bws?

Answer 58

occlusal plan horizontal

Question 59

when xraying pt what should you think about before hand.....?

Answer 59

pt dose constraints and radiographic audit

Question 60

under which heading checks the performance of the counterbalance for the correct position of the tube head

Answer 60

equipment checks

Question 61

the coin test comes under which heading/checks?

Answer 61

darkroom inspection

Question 62

what is directly associated with step-wedge test?

Answer 62

image processing

Question 63

inverse square law is best related to what?

Answer 63

increasing the distance between the radiation source and the personnel

Question 64

Your employer gives training on new receptor holders, , what are you most likely to consider when using these?

Answer 64

avoiding unnecessary radiography

Question 65

A 16 year old boy comes to do work experience at the practice, you ask work colleague to look after him whilst xrays are being taken. What should be considered?

Answer 65

reducing exposure factors

Question 66

Changing from D speed to E speed, what should be considered?

Answer 66

reduce exposure factors