Module 4

Question 1

Equivalent Dose (HT)

Answer 1

Allows the different Radiobiological effectiveness (RBE)

comparison

Question 2

Radiation weighting factor WR

Answer 2

represents different the biological effects of different

radiations on different tissues

Question 3

Tissue weighting factor WT

Answer 3

Conversion of dose to specific area to whole body

Question 4

Bitewing/Periapical Dose

Answer 4

0.0003 – 0.022 mSv

Question 5

Panoramic Dose

Answer 5

0.0027-0.038 mSv

Question 6

Upper standard occlusal Dose

Answer 6

0.008 mSv

Question 7

Lateral Cephalometric Dose

Answer 7

0.0022-0.0056 mSv

Question 8

Collective dose

Answer 8

effective dose (E) x population

Question 9

Dose Limit Classified worker

Answer 9

20mSv

Question 10

Dose Limit Non Classified worker

Answer 10

6 mSv

Question 11

General Public Dose Limit

Answer 11

1 mSv

Question 12

Risk Factor intra oral films traditional

Answer 12

1 fatal cancer in every 2 million

Question 13

Risk Factor intra oral film recommended equipment

Answer 13

1 fatal cancer in every 20 million

Question 14

Risk Factor panoramic radiograph

Answer 14

1 in 1,000,000

Question 15

Direct Action (Damage)

Answer 15

Energy from ejected electron (photoelectrons)
or the x-ray photon is transferred to the cells
DNA, RNA or protein enzymes

Question 16

Indirect Action

Answer 16

Most common reaction as 80% of our body
consists of water
When radiation hits the water molecules 
Ionisation occurs. This produces ions and free 
radicals.

Question 17

Deterministic Effects

Answer 17

Will definitely happen from a specific high

dose of radiation

Question 18

Stochastic Effects

Answer 18

Every dose has the possibility, No safe dose or level

Question 19

Genetic Effects

Answer 19

Gene or chromosomes mutate can be can be

spontaneous or caused by radiation, no threshold dose

Question 20

When is the most sensitive time for a unborn child?

Answer 20

3-7 weeks