Practice Exam #2 1-12

Question 1

Which of the following makes water a good choice for shielding neutron radiation?

Answer 1

1. High hydrogen content
2. High cross section for interactions (20 barns)
3. Low cost

Question 2

Neutron interactions within materials such as iron, due to inelastic scattering, can cause a large change in neutron energy level. True or False?

Answer 2

True

Question 3

Once a neutron has been slowed down to thermal energy level, it can be captured by the shielding material resulting in which of the following?

Answer 3

Release of a gamma ray

Question 4

What statement best describes a beta particle?

Answer 4

Are negatively charged particles that have the same mass as an electron

Question 5

Which of the following properties makes gamma radiation difficult to shield?

Answer 5

Gamma radiation has no mass or charge

Question 6

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

Answer 6

1. High atomic mass number

2. High density

Question 7

Which of the following material is best for shielding gamma radiation?

Answer 7

Lead

Question 8

Beta particles can be shielded by a thin sheet of aluminum. True or False?

Answer 8

True

Question 9

Name a definition for one half-value layer?

Answer 9

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

Question 10

What is the rule of thumb for a half-value layer for Co-60 when the shielding material is lead?

Answer 10

.49 inches

Question 11

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

Answer 11

Neutrons