Fission reactor flux monitors based on single-crystal CVD diamond films

S. Almaviva, M. Marinelli, E. Milani, G. Prestopino, A. Tucciarone, C. Verona, G. Verona-Rinati, M. Angelone, D. Lattanzi, M. Pillon, R. Rosa

Research output: Contribution to journalArticle

3 Citations (Scopus)


Diamond based thermal neutron flux monitors have been fabricated using single crystal diamond films, grown by chemical vapour deposition. A 3 μm thick6LiF layer was thermally evaporated on the detector surface as a converting material for thermal neutron monitoring via the6Li(n, α) T nuclear reaction. The detectors were tested in a fission nuclear reactor. One of them was positioned 80 cm above the core midplane, where the neutron flux is 2.2 × 109neutrons/cm2s at 1 MW resulting in a device count rate of about 150 000 cps. Good stability and reproducibility of the device output were proved over the whole reactor power range (up to 1 MW). During the irradiation, several pulse height spectra were recorded, in which both products of the6Li(n, α) T reaction, e.g. 2.73 MeV tritium and the 2.06 MeV α, were clearly identified, thus excluding a degradation of the detector response. A comparison with a reference fission chamber monitor pointed out a limitation of the adopted readout electronics at high count rates, due to multiple pile-up processes. However, once this effect is properly accounted for, a good linearity of the diamond flux monitor response is observed as a function of the fission chamber one, as well as an excellent agreement between the temporal behaviour of the two detector response. © 2007 WILEY-VCH Verlag GmbH & Co. KGaA.
Original languageEnglish
Pages (from-to)2991 - 2996
Number of pages6
JournalPhysica Status Solidi (A) Applications and Materials Science
Issue number9
Publication statusPublished - Sep 2007
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering
  • Materials Chemistry

Cite this

Almaviva, S., Marinelli, M., Milani, E., Prestopino, G., Tucciarone, A., Verona, C., ... Rosa, R. (2007). Fission reactor flux monitors based on single-crystal CVD diamond films. Physica Status Solidi (A) Applications and Materials Science, 204(9), 2991 - 2996.