Module 1B Quiz

Question 1

An individual is exposed to 50 Gy of x radiation to the lungs (0.12). What is the equivalent dose the patient has recieved?

Answer 1

50 sv

Question 2

To reduce patient exposure:
1.) reduce the amount of “beam on” time
2.) use as much distance as possible between the tube and the patient
3.) sheild the patient appropriately

a.) 1 only
b.) 1 and 3 only
c.) 1, 2 and 3
d.) 2 and 4 only

Answer 2

c.) 1, 2 and 3

Question 3

Removal of an electron from an atom is called what?

a.) radiation
b.) efficacy
c.) ionization
d.) biologic effects

Answer 3

c.) ionization

Question 4

Which electrons are more tightly bound to the nucleus of an atom?

a.) they are all bound equally
b.) k shell
c.) m shell
d.) l shell

Answer 4

b.) k shell

Question 5

The process most responsible for contrast differences on the image is:

a.) coherent scattering
b.) photoelectric absorption
c.) compton scattering
d.) photodisintegration

Answer 5

b.) photoelectric absorption

Question 6

Which of the following interactions with matter only occur in therapeutic radiology?

1.) photoelectric absorption
2.) pair production
3.) photodisintegration

a.) 1, 2 and 3
b.) 1 and 2 only
c.) 1 only
d.) 2 and 3 only

Answer 6

d.) 2 and 3 only

Question 7

.030 Gy is equal to:

a.) 300 mGy
b.) .30 mGy
c.) 30 mGy
d.) 3 mGy

Answer 7

c.) 30 mGy

Question 8

If _________ increases, radiographer dose __________.

a.) photoelectric absorption, increases
b.) compton scatter, increases
c.) characteristic, decreases
d.) coherent scatter, increases

Answer 8

b.) compton scatter, increases

Question 9

The Wr for xrays and gamma rays is:

a.) 15
b.) 20
c.) 5
d.) 1

Answer 9

d.) 1

Question 10

Although coherent scattering is most likely to occur ____________, some of this unmodified scattering occurs throughout the diagnostic range and may result in small amounts of radiographic fog.

a.) above 100 kev
b.) between 30 kev and 60 kev
c.) at less than 10 kev
d.) between 60 kev and 90 kev

Answer 10

c.) at less than 10 kev

Question 11

The SI unit of D (absorbed dose) is the:

a.) R
b.) Sv
c.) Rem
d.) Gy

Answer 11

d.) Gy

Question 12

The amount of energy per unit mass absorbed by the irradiatied object is the:

a.) Wt
b.) Efd
c.) D
d.) EqD

Answer 12

c.) D

Question 13

_________ measures the overall risk of exposure but takes into consideration the type of radiation and the radiosensitivity of the tissue.

a.) D
b.) EfD
c.) x
d.) EqD

Answer 13

b.) EfD

Question 14

The reduction of number of primary photons in the beam is called:

a.) absorption
b.) attenuation
c.) direct transmission
d.) scatter

Answer 14

b.) attenuation

Question 15

__________ scatter is all directional

Answer 15

compton

Question 16

Which of the following is the intention behind the ALARA concept?

Answer 16

to keep radiation exposure and consequent dose at the lowest possible level

Question 17

Which of the followign provides the basis for determining whether an imaging procedure or practice is justififed?

a.) ALARA program
b.) BERT method
c.) TRACE program
d.) diagnostic efficacy

Answer 17

d.) diagnostic efficacy

Question 18

Which of the following terms are synonymous?

1.) coherent
2.) classical
3.) rayleigh

a.) 1 and 2 only
b.) 2 and 3 only
c.) 1, 2 and 3
d.) 1 and 3 only

Answer 18

c.) 1, 2 and 3

Question 19

As photoelectric absorption occurs within the patient, the patients dose ________.

a.) increases
b.) remains the same
c.) decreases

Answer 19

a.) increases

Question 20

________ is kinetic energy that passes from one location to another.

a.) photoelectric energy
b.) ionization
c.) electromagnetic energy
d.) radiation

Answer 20

d.) radiation

Question 21

Agents that increases brightness on the radiographic image are called:

a.) image formation photons
b.) contrast media
c.) fluorescent yeild
d.) xray photons

Answer 21

b.) contrast media

Question 22

What is the correct formula for calculating equivalent dose?

Answer 22

D x Wr

Question 23

EfD describes which of the following:

a.) the total biologic damage to a human that is caused by equivalent doses recieved by specific organs
b.) the electrical charge produced in a kilogram of dry air by ionizing radiation
c.) the number of electron ion pairs in a specific volume of air
d.) the dose of ionizing radiation required to cause diffuse redness over an area of skin

Answer 23

a.) the total biologic damage to a human that is caused by equivalent doses recieved by specific organs

Question 24

One millirem equals _______ rem.

a.) 1/10,000
b.) 1/100
c.) 1/1000
d.) 1/10

Answer 24

c.) 1/1000

Question 25

As kvp increases, the percentage of ________ interactions increases.

a.) coherent
b.) photoelectric
c.) compton
d.) rayleigh

Answer 25

c.) compton

Question 26

What is the correct formula for calculating EfD?

Answer 26

D x Wr x Wt

Question 27

Z refers to the number of:

a.) electrons in the outer shell of an atom
b.) electrons is the nucleus of the atom
c.) protons in the nucleus of the atom
d.) neutrons in the nucleus of the atom

Answer 27

c.) protons in the nucleus of the atom

Question 28

During _________, no energy is transferred in the interaction.

a.) characteristic interaction
b.) photoelectric absorption
c.) coherent interaction
d.) compton scattering

Answer 28

c.) coherent interaction

Question 29

Which of the following is most dangerous to the patient?

a.) photoelectric absorption
b.) coherent scatter
c.) compton scatter
d.) pair production

Answer 29

a.) photoelectric absorption

Question 30

convert 20 Sv to mSv

Answer 30

20,000 msv

Question 31

A photon that exits the tube, but hasnt yet entered the patient is called ________.

a.) primary photon
b.) remnant photon
c.) ionized photon
d.) exit photon

Answer 31

a.) primary photn

Question 32

The reduction of the number of primary photons in the beam is called:

a.) attenuation
b.) absorbtion
c.) direct transmission
d.) indirect transmission

Answer 32

a.) attenuation

Question 33

1 msv equal how many sv

Answer 33

.001

Question 34

KVP controls :

a.) quantity of photons in the beam
b.) quality, or penetrating power of the beam
c.) the direction in which scatter may occur
d.) the random interaction of photons with the image receptor

Answer 34

b.) quality, or penetrating power of the beam

Question 35

_________ influences attenuation.

1.) mass density
2.) atomic number
3.) energy of exiting photons

a.) 1 and 2
b.) 2 only
c.) 2 and 3
d.) 1 and 3

Answer 35

a.) 1 and 2

Question 36

What is the result of coherent scattering?

a.) small angle change in the direction of the incident photon
b.) only some of the energy is transferried from the incident photon to the irradated object
c.) production of a negatron and a positron
d.) all energy is transferred from the incident photon to the atom of the irriadated object

Answer 36

a.) small angle change in the direction of the incident photon

Question 37

During the photoelectric interaction, the incident xray photon energy must be greater than the binding energy of outer shell electrons.

a.) true
b.) false

Answer 37

b.) false

Question 38

When a ________ interaction occurs, scatter can occur in all directions.

a.) coherent
b.) compton
c.) attenuation
d.) photoelectric

Answer 38

b.) compton

Question 39

Coherent scatter will occur at:

Answer 39

less than 10 kev

Question 40

Short wavelengths and higher frequencies are associated with __________.

a.) less biological damage
b.) potential for more biological damage

Answer 40

b.) potential for more biological damage