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Self-Powered Neutron Detectors have been used effectively as in-core flux monitors for over twenty-five years in nuclear power reactors worldwide. The typical SPND is a coaxial cable consisting of an inner electrode (the emitter), surrounded by insulation, and an outer electrode (the collector).
Various types of SPND emitters are used in power reactor application
- Inconel 600
- Rhodium (Rh103
- Vanadium (V51)
- Platinum (Pt195)
- Cadmium (Cd)
General Characteristics
- Need no power supply
- Simple and robust structure
- Relatively small mechanical size desired for in-core installation
- Good stability under temperature & pressure conditions.