Probing the defect nanostructure of helium and proton tracks in LiF:Mg,Ti using optical absorption: Implications to track structure theory calculations of heavy charged particle relative efficiency
作者： I. Eliyahu , Y.S. Horowitz , L. Oster , L. Weissman , A. Kreisel
DOI: 10.1016/J.NIMB.2015.02.072
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摘要: Abstract A major objective of track structure theory (TST) is the calculation heavy charged particle (HCP) induced effects. Previous calculations have been based exclusively on radiation action/dose response released secondary electrons during HCP slowing down. The validity this presumption investigated herein using optical absorption (OA) measurements LiF:Mg,Ti (TLD-100) samples following irradiation with 1.4 MeV protons and 4 MeV He ions at levels fluence from 1010 cm−2 to 2 × 1014 cm−2. bands in OA spectrum are 5.08 eV (F band), 4.77 eV, 5.45 eV 4.0 eV band (associated trapping leading composite peak 5 thermoluminescence (TL) glow curve). maximum intensity occurs a temperature ∼200 °C curve used for most dosimetric applications. TST use experimentally measured dose low ionization density (LID) 60Co photon over dose-range 10–105 Gy simulation action electron spectrum. Following proton saturation concentration F 4.77 eV approximately one order magnitude greater than LID indicating enhanced creation relevant defects. Relative efficiencies, ηHCP, calculated by compared values, ηm, 1011 cm−2 where linear due negligible overlap. For band, values ηm/ηHCP = 2.0 2.6 respectively arise neglect Fluorine vacancy/F center HCPs calculations. It demonstrated that kinetic analysis simulating vacancy creation, incorporated into calculation, can lead ηm = ηHCP. On other hand, ηm/ηHCP much less unity 0.18
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