| 摘要 |
A process measurement system utilizes fast neutron backscattering for measuring density, level, and interfaces of substantially non-hydrogenous materials, that is, materials other than those containing hydrogen. Measurement of materials in thick walled vessels is accommodated. The system contains a fast neutron source for emitting neutrons into the material to be measured. A detection system is mounted near the neutron source to receive the backscattered neutrons. An energy degradation system reduces the energy level of the fast neutrons down to a desired range for detection.
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