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1.6.2 Neutron thermalization . . . . . . 13
1.6.3 Neutron Diffusion and absorption 14
1.6.4 Neutron activation . . . . . . . . 15
1.7 Radiation protection of neutron . . . . . 16
1.8 Neutron Gauging and Non-Destructive
Evaluation Principle . . . . . . . . . . . 21
1.9 Summary . . . . . . . . . . . . . . . . . 21
2 Neutron Back-Scattered Technique and Ap-
plication 23
2.1 Principle of Neutron Back-Scattered . . 23
2.2 Gauge design . . . . . . . . . . . . . . . 24
2.3 Applications in level measurement . . . 28
2.4 Applications in Interface measurement . 31
2.5 Application in Tank Floor Gap Determi-
nation . . . . . . . . . . . . . . . . . . . 32
2.6 Measurement of Soil Moisture . . . . . 35
2.6.1 Application in Hydrology. . . . . 37
2.7 Application in Agriculture . . . . . . . . 39
2.7.1 Application in Civil Engineering . 41
2.7.2 Management of a Neutron Mois-
ture Gauge . . . . . . . . . . . . 44
2.8 Summary . . . . . . . . . . . . . . . . . 47
3 Neutron Activation Analysis 49
3.1 Principle of Neutron Activation . . . . . 50
3.2 Irradiation channels . . . . . . . . . . . 57
3.3 Irradiation Apparatus . . . . . . . . . . . 60
3.4 Sample preparation . . . . . . . . . . . 63
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