Synthetic single crystal diamond as a fission reactor neutron flux monitor

Marinelli, Marco; Milani, E.; Prestopino, G.; Tucciarone, A.; Verona, C.; Verona-Rinati, G.; Angelone, M.; Lattanzi, D.; Pillon, M.; Rosa, R.; Santoro, E.
April 2007
Applied Physics Letters;4/30/2007, Vol. 90 Issue 18, p183509
Academic Journal
Thermal neutron flux monitors were fabricated using chemical vapor deposited single crystal diamond in a p-type/intrinsic/metal/6LiF layered structure. They were placed 80 cm above the core midplane of a 1 MW research fission reactor, where the maximum neutron flux is 2.2×109 neutrons/cm2 s. Good stability and reproducibility of the device response were observed over the whole reactor power range. A 150 000 counts/s count rate was measured at the maximum reactor power with no degradation of the detector signal. As the multiple pile-up process due to the slow readout electronics is accounted for, an excellent linearity of the diamond response is observed.


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