Neutron Dosimetry

Do neutrons generate bremsstrahlung x-rays?

No

Are the ranges of secondary charged particles resulting from neutrons short or long?

Short

Why is the absorbed dose of neutrons effectively equal to kerma and why is the CPE well approximated?

neutrons do not generate bremsstrahlung x rays and the ranges of the heavy secondary charged particles are relatively short

What is the most probably energy for thermal neutrons?

0.025 eV

Epithermal neutrons

1 eV to 1 keV. Thermal neutron capture in hydrogen dominates in this range (resulting in γ rays)

Fast Neutrons

Neutron energy > 100 keV. Recoil protons resulting from elastic scattering of hydrogen nuclei dominates.

What are the five main processes by which neutrons interact with a material (the nuclei)?

• Elastic scattering

• Inelastic scattering

• Neutron capture

• Nuclear spallation

• Nuclear fission

Benefit of LiF TLD for neutron dosimetry?

LiF has an advantage of having some 6Li in it, which is highly favorable for a 6Li(n,alpha) reaction. The Hydrogen in a person’s body converts the higher energy neutrons to thermal neutrons, increasing the sensitivity even more.

How is are TLD materials made sensitive to fast neutrons?

neutrons by using a plastic or other hydrogen-containing layer in contact with the material.