ASNT Neutron Radiography 2

Question 1

What is the approximate kinetic energy range for thermal neutrons used in neutron radiography?

Accepted Answer

Below 0.5 eV

Answer

1 keV to 10 keV

Answer

0.1 MeV to 1 MeV

Answer

Above 10 MeV

Question 2

In the transfer (indirect) neutron radiography method, what is the purpose of using an activation foil?

Accepted Answer

To become radioactive during exposure and later expose film away from the neutron source

Answer

To amplify the neutron beam intensity

Answer

To filter fast neutrons from the beam

Answer

To calibrate the neutron fluence rate

Question 3

What major radiation safety hazard is unique to neutron radiography compared to conventional X-radiography?

Accepted Answer

Induced radioactivity in inspected components and equipment

Answer

Infrared heat emission from the beam port

Answer

Ultraviolet skin burns from scattered radiation

Answer

Static charge buildup on film cassettes

Question 4

Which isotope produces prompt gamma radiation with a large thermal neutron cross-section and is sometimes used in real-time neutron imaging scintillator screens?

Accepted Answer

Boron-10

Answer

Carbon-12

Answer

Oxygen-16

Answer

Nitrogen-14

Question 5

What is the term for the image quality indicator (IQI) used to verify sensitivity and resolution in neutron radiography?

Accepted Answer

Penetrameter

Answer

Beam quality indicator

Answer

Neutron sensitivity coupon

Answer

Beam purity indicator

Question 6

Fast neutron radiography differs from thermal neutron radiography primarily in that fast neutrons:

Accepted Answer

Require no moderator and penetrate more deeply into high-density materials

Answer

Interact more strongly with hydrogen than thermal neutrons do

Answer

Cannot penetrate metallic materials

Answer

Always require a reactor source

Question 7

What property of water makes it an effective neutron moderator AND a neutron shield in reactor-based neutron radiography facilities?

Accepted Answer

Its high hydrogen content, which thermalizes and absorbs neutrons effectively

Answer

Its high atomic number and electron density

Answer

Its high melting point and thermal conductivity

Answer

Its ability to reflect neutrons via total internal reflection