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Flashcards in Radio Exam 3 Deck (106)
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1

The latent period in radiation biology is the time between...

Exposure to x-radiation and clinical symptoms

2

A free radical

An uncharged molecule, has an unpaired electron in the outer shell, highly reactive/unstable, combines with molecules to form toxins

3

Direct radiation injury occurs when...

X-ray protons hit critical targets within a cell

4

Indirect radiation injury occurs when...

X-ray photons are absorbed and form toxins

5

Which relationship describes the response of tissues to radiation

Linear, nonthreshold

6

Which factors contribute to radiation injury

Total dose, dose rate, age, cell sensitivity

7

Long-term effects are seen with small amounts of radiation absorbed in a long period

True

8

Radiation injuries that are not seen in the person irradiated but that occur in future generations are termed...

Genetic effects

9

What is most susceptible to ionizing radiation

Small lymphocyte

10

The sensitivity of tissues to radiation is determined by

Mitotic activity, cell differentiation, cell metabolism

11

What is considered radioresistant

Mature bone cells

12

An organ that, if damaged, diminishes the quality of an individuals life is termed

Critical

13

The traditional unit for measuring x-ray exposure in air is termed

Roentgen

14

Which radiation unit is determined by the quality factor (QF)

Rem

15

The unit for measuring the absorption of x-rays is termed

Rad

16

1 R = 2.58 X 10 to the -4 C/kg, 1 Gy = 100 rad, 1 Sv = 100 rem, 1 rem = rad X QF

All correct conversions

17

What traditional unit does not have an SI equivalent

Roentgen

18

What is used only for x-rays

Roentgen

19

What is the approximate average dose of background radiation received by an individual in the United States

300 mrem/ 3.0 mSv

20

What is the greatest contributor to artificial radiation exposure

Medical radiation

21

The amount of radiation exposure an individual receives varies depending on

Receptor type, collimation, technique

22

A single intraoral image using digital sensor results in an effective exposure dose of

0.002 mSv

23

What is the dose at which leukemia induction is most likely to occur

5000 mrad (0.05) Gy

24

Smallest effective does using digital receptors

Single periapical/rectangular collimation

25

Second smallest effective dose using digital receptors

Single bite-wing/round collimation

26

3rd/medium effective dose using digital receptors

Panoramic

27

4th/large effective dose using digital receptors

Complete series/rectangular collimation

28

Largest effective dose using digital receptors

Complete series/round collimation

29

Smallest annual source of radiation exposure

Consumer products

30

2nd annual source of radiation exposure

Terrestrial (soil)