Practice Exam #5 1-11

Question 1

To shield gamma radiation the attenuating material should be made of which of the following?

Answer 1

High density

Question 2

Which of the following is the best definition for one half-value layer?

Answer 2

The amount of shielding that would reduce radiation intensity to one half of the original dose rate.

Question 3

Isotopes of a given element have the same atomic number but have different number of _____________.

Answer 3

Neutrons

Question 4

Which of the following cells are the least sensitive to ionizing radiation?

Answer 4

Muscle

Question 5

___________________ are defined in 10CFR20 and are used to convert Rads into Rem.

Answer 5

REB’s

Question 6

If workers were pulling a tool out of the water, and you took a dose rate at the surface and it read 40 mrem/hr, and the tool was 2 feet below the surface.

What would you expect the dose rates to be once it reaches the surface? You can assume that the dose rate is being generated by Co-60.

Answer 6

4000 mrem/hr

Question 7

The half-life of a radionuclide is best defined as:

Answer 7

The amount of time it takes for the activity present to be reduced to one-half.

Question 8

A curie is a measure of radioactivity and is defined as ____________ disintegrations per second.

Answer 8

3.7 X 10¹º

Question 9

Which of the following statements best describes Photoelectric Effect?

Answer 9

The photon transfers all of its energy to an electron, ejecting the electron from the atom.