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Neutron induced radiation damage in graphite

Neutron induced radiation damage in graphite A.Goffredi , M.Riccò, M.Belli, D.Pontiroli, T.Shiroka. 2+. 3+. Basic Idea. Neutrons. Graphite containing Boron. Bulk Ferromagnetic Graphite. LENA Reactor University of Pavia, Department of Nuclear Physics. Reactor Details.

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Neutron induced radiation damage in graphite

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  1. Neutron induced radiation damage in graphite A.Goffredi, M.Riccò, M.Belli, D.Pontiroli, T.Shiroka

  2. 2+ 3+ Basic Idea Neutrons Graphite containing Boron Bulk Ferromagnetic Graphite LENA Reactor University of Pavia, Department of Nuclear Physics

  3. Reactor Details φn(flux) = 1.7· 10 12 n / cm2 sec 1.7 • relatively high flux • good B cross section • good number of events Pablo Fluence: Фp = 2 nC / μm2 = 1.25 · 10 18 p+/cm2 Фp / φn = 7.3 ·10 5 sec ~ 1 week Normal time exposure

  4. n(x) = n0 exp (-x/λ) n(x) x sample SRIM2003 Montecarlo Simulations

  5. SRIM2003 Montecarlo Simulations

  6. Boron insertion in Graphite Intercalation with Boron compounds Graphite-Boron Composite Real diffusion Simple mixing (possible molecule: NaBH4; no problem with secondary radioactive product)

  7. 135° C Tetraglyme 3 (NH4)SO4 + 6 NaBH4 2 + 3 Na2SO4 + 18 H2 Borazine Boron Intercalated Graphite • Borazine is called the Inorganic Benzene: good affinity; • Planar molecule even if there’s the N pairs; • Unfortunately preliminary attempts were not successful so • Promising intercalating molecule; • Optimizing intercalating conditions.

  8. KAPTON Polyborazine KAPTON Boron Intercalated Kapton • Boron Chemical bonding: • Subtitution on the aromatic rings; • Copolymer: PDMA/ODA // Poly-borazine. Film Sandwich

  9. Thanks for your attention!!

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