2.1 Introduction
2.2 Neutron Resonance Densitometry
2.2.1 The Concept of NRD
Nucleus | Reaction | Prompt γ rays (KeV) | First resonance (KeV) |
---|---|---|---|
1H |
1H (n, γ) 2H | 2,223 | – |
10B |
10B (n, αγ) 7Li | 478 | 170 |
27Al |
27Al (n, γ) 28 Al | 3,034, 7,724 | 5.9 |
28Si |
28Si (n, γ) 29Si | 3,539, 4,934 | 31.7 |
53Cr |
53Cr (n, γ) 54Cr | 835, 8,885 | 4.2 |
56Fe |
56Fe (n, γ) 57Fe | 7,631, 7,646 | 1.1 |
59Co |
59Co (n, γ) 60Co | 230, 6,877 | 0.132 |
58Ni |
58Ni (n, γ) 59Ni | 465, 8,999 | 6.9 |
2.2.2 A Rough Draft of an NRD Facility
Nucleus | Concentration in a fuel (kg/tHM) | Statistic error (%) |
---|---|---|
238Pu | 0.19 | 0.85 |
239Pu | 5.25 | 0.074 |
240Pu | 2.13 | 0.051 |
241Pu | 1.23 | 0.23 |
242Pu | 0.48 | 0.069 |
235U | 14.6 | 0.049 |
238U | 928 | 0.010 |