General Principles of Neutron Transport

Question 1

Neutron Transport

Answer 1

The process in which neutrons propagate through the atoms in a physical system.

Question 2

7 Independent Variables for a 3-D Neutron Transport Problem

Answer 2

1. x
2. y
3. z
4. omega
5. theta
6. Energy (E)
7. time, t

Question 3

Isotropic

Answer 3

uniformly distributed on the unit sphere

Question 4

mean free path

Answer 4

mean distance to collision

Question 5

angular neutron density

Answer 5

the number of neutrons in dVd(omega)dE about (x,omega,E) at time t

Question 6

internal neutron source

Answer 6

generally produced by radioactive decay, is located inside the physical system “V” and is usually isotropic. Q(x,E,t)

Question 7

boundary neutron source

Answer 7

specified neutron flux that enters the physical s system “V” through the outer boundary dV. “V” is usually assumed to be convex.