ASNT Neutron Radiography

Question 1

What fundamental particle is used as the probing radiation in neutron radiography?

Accepted Answer

Neutron

Answer

Electron

Answer

Gamma photon

Answer

Proton

Question 2

Which of the following is the primary advantage of neutron radiography over conventional X-ray radiography?

Accepted Answer

Ability to detect light elements like hydrogen in dense metal assemblies

Answer

Higher spatial resolution

Answer

Lower radiation dose to personnel

Answer

Lower equipment cost

Question 3

Which class of materials is most easily detected by thermal neutron radiography due to their high neutron attenuation cross-sections?

Accepted Answer

Light elements such as hydrogen, lithium, and boron

Answer

High-density metals such as lead and tungsten

Answer

Ferromagnetic materials such as iron and nickel

Answer

Ceramic oxides such as alumina and zirconia

Question 4

What is the most common facility-based neutron source used for neutron radiography?

Accepted Answer

Nuclear research reactor

Answer

Linear electron accelerator

Answer

Van de Graaff generator

Answer

Cyclotron proton accelerator

Question 5

In the direct neutron radiography method, which converter screen material is most commonly paired with X-ray film?

Accepted Answer

Gadolinium foil

Answer

Lead foil

Answer

Copper foil

Answer

Tungsten foil

Question 6

What does the L/D ratio represent in a neutron radiography system?

Accepted Answer

The ratio of the collimator length to the aperture diameter

Answer

The ratio of neutron energy to detector sensitivity

Answer

The ratio of lead shielding thickness to detector area

Answer

The ratio of beam divergence to film density

Question 7

Which ASTM standard specifically addresses practice for thermal neutron radiography of materials?

Accepted Answer

ASTM E748

Answer

ASTM E1032

Answer

ASTM E1030

Answer

ASTM E94