Radiation Protection

Question 1

What unit is the absorbed dose?

Answer 1

Gray (gy)

Question 2

What is absorbed dose measure in?

Answer 2

Joules/kg

Question 3

What is the equivalent dose?

Answer 3

Absorbed dose x radiation weighting factor

Question 4

What is the weighting factor?

Answer 4

1

Question 5

What is equivalent dose measures in?

Answer 5

Sv (sievert )

Question 6

What is effective dose?

Answer 6

Equivalent dose x tissue weighting factor

Question 7

What is the average background radiation per year in the uk?

Answer 7

2.5 milli sv

Question 8

What is the dose from a panoramic radiographic examination?

Answer 8

4-30 micro sv

Question 9

What is the dose from a periapical radiographic examination?

Answer 9

1-8.3 micro sv

Question 10

What are somatic effects of radiation?

Answer 10

Effects, effecting those irradiated

Question 11

What are deterministic effects of radiation?

Answer 11

Hair loss
Cataract
GI upset 
Effects on unborn child
SHOULD NOT HAPPEN IN DENTISTRY

Question 12

What are non deterministic effects? (Stochastic)

Answer 12

May occur, development random
Leukaemias/ tumours
Caused by any dose
CAN OCCUR IN DENTISTRY

Question 13

What is the risk of cancer re. Intra oral radiography examination?

Answer 13

0.07-0.07 in 1000000

Question 14

What are the cancer risks re. Panoramic radiographic examination

Answer 14

0.29-1.9 I’m 1000000

Question 15

Why are younger patients more at risk

Answer 15

More dividing cells

Longer life span over which to develop effect

Question 16

What are the 3 principles re. Radiation protection?

Answer 16

Justification
Optimisation
Dose limitation

Question 17

Who is allowed in controlled area?

Answer 17

Only the patient

Question 18

What distance should people be away from area?

Answer 18

1.5m

2m in DDH

Question 19

What is the absorbed dose?

Answer 19

The measure of the amount of energy deposited in a medium per unit mass of the medium