ARRT RADIATION PHYSICS AND RADIOBIOLOGY EXAM |ACTUAL QUESTIONS AND VERIFIED ANSWERS|NEWEST UPDATE|GRADED A+

|ACTUAL QUESTIONS AND VERIFIED



Question 1

All of the following radiation exposure responses exhibit a nonlinear threshold dose-
response relationship except:

1. skin erythema

2. hematologic depression

3. radiation lethality

4. leukemia

CORRECT ANSWER

leukemia (this a linear-dose response)




Question 2

Which has no threshold, linear dose response or nonlinear dose response curve?

CORRECT ANSWER

linear dose response




Question 3

Which has a threshold, linear does response or nonlinear dose response curve?

CORRECT ANSWER

nonlinear dose response curve




Question 4

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,Nonlinear dose response curve, has somatic effects of what?

CORRECT ANSWER

skin erythema, epilation, hematologic depression, and radiation lethality (death).




Question 5

Late or long term effects of radiation exposure are generally represented by which of the
following dose-response?

CORRECT ANSWER

linear non threshold



(most late effects do not have a threshold)




Question 6

Which of the following expresses the gonadal dose that, if received by every member of
the population, would be expected to produce the same total genetic effect on that
population as the actual doses received by each of the individuals?

CORRECT ANSWER

genetically significant dose




Question 7

Muscle tissue absorbs more radiation than fat tissue because muscle tissue has which of
the following?

1. vastly higher average atomic number

2. vastly lower average atomic number

3. higher tissue density (mass/volume)

4. lower tissue density (mass/volume)


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,CORRECT ANSWER

higher tissue density (mass/volume)




Question 8

Which type of dose response relationship represents radiation induced leukemia and
genetic effects ?

1. linear, threshold

2. nonlinear, threshold

3. linear, non threshold

4. nonlinear, nonthreshold

CORRECT ANSWER

linear, non threshold




Question 9

Biologic material is least sensitive to irradiation under which of the following conditions?

1. anoxic

2. hypoxic

3. oxygenated

4. hyperbaric

CORRECT ANSWER

Anoxic



(this refers to tissue without oxygen. This answer is correct because tissue is most sensitive
when it is oxygenated and least when it lacking oxygen.)




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, Question 10

The dose-response curve that appears to be valid for genetic and some somatic effects is
the

1. linear

2. nonlinear

3. nonthreshold

CORRECT ANSWER

1 and 3 only




Question 11

Select the factors that lead to the production of a high-energy bremsstrahlung (brems) x-
ray when a filament (projectile) electron interacts with an anode tungsten atom (select the
four that apply)

A. The filament electron passes far away from the nucleus of a tungsten atom.

B. The filament electron travels close to the nucleus of a tungsten atom.

C. The nuclear electrostatic field creates a strong force of attraction on the passing filament
electron.

D. The nuclear electrostatic field creates a weak force of attraction on the passing filament
electron.

E. The filament electron arrives at the anode with high kinetic energy.

F. The filament electron arrives at the anode with low kinetic energy.

G. The atomic number of the tungsten atom is high.

H. The atomic number of the tungsten atom is low.

CORRECT ANSWER

-the filament electron travels close to the nucleus of a tungsten atom

-the nuclear electrostatic field creates a strong force of attraction on the passing filament
electron

-the filament electron arrives at the anode with high kinetic energy


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