New Structured Scintillators for Neutron Radiography

摘要: Abstract We report on the development of novel neutron scintillators fabricated in microcolumnar formats using physical vapour deposition (PVD) method. Such structures mitigate conventional trade-off between spatial resolution and detection efficiency by channelling scintillation light towards detector while minimizing lateral spread film. Consequently, high contrast images can be acquired a time efficient manner. In this paper, we discuss methods characterization for scintillator films made from three distinct compositions, Thallium (Tl) or Europium (Eu) doped Lithium CesiumIodide (Li3Cs2I5:Tl,Eu, referred to as LCI), Tl Eudoped Sodium Iodide (LixNa1-xI:Tl,Eu, LNI), Cerium (Ce)-doped Gadolinium (GdI3:Ce, GDI). LCI LNI are derived well-known CsI NaI incorporation 6Li into their lattice. Based our measurements reported here, LCI/LNI have shown exhibit bright emissions, fast, sub-microsecond decay, an ability effectively discriminate gamma interactions pulse shape (PSD) and/or height (PHD) discrimination. has density 4.5 g/cm3, measured peak emission wavelength 460 nm (doped with Eu), yield ∼50,000 photons/thermal neutron. 3.6 g/cm3, at 420 nm, ∼100,000 The recently discovered GDI exhibits excellent properties including up 5,000 interaction, 550 nm green emission, rise ∼0.5 ns primary decay ∼38 ns (Glodo et al., 2006). Its thermal cross-section ∼255 kb makes it attractive candidate imaging. Although 5.2 gm/cm3 effective atomic number 57, its sensitivity minimized lowering film thickness maximized through use enriched Gd. fabrication micro-structured these materials evaporation technique permits cost-effective volume synthesis high-quality over large areas (20 cm x 20 cm) short time. addition, stoichiometry dopant control not possible crystal growth.