Measurement of the thermoluminescent response (supralinearity and efficiency) of LiF : Mg,Ti exposed to 0.7 MeV protons
1998; Elsevier BV; Volume: 134; Issue: 1 Linguagem: Inglês
10.1016/s0168-583x(97)00526-0
ISSN1872-9584
Autores Tópico(s)Luminescence Properties of Advanced Materials
ResumoThe irradiation of LiF : Mg,Ti (TLD-100) chips by a defocused 0.7 MeV proton beam from an electrostatic accelerator has been achieved using radiochromic dye film to evaluate the beam transversal intensity distribution. The dose-response has been measured at fluences between 2.4 × 108 and 5.7 × 1011 p/cm2 and peaks 3–9 show linear-supralinear-sublinear response. The efficiency, relative to 60Co γ-rays, measured for the total thermoluminescent (TL) signal and peaks 5 and 7, equals 0.33, 0.22 and 1.4, respectively. The comparison of these and other low-energy data for peak 5 with Track Structure Theory (TST) efficiency calculations indicate that the latter must take into account the stopping of the incident ions in the dosimeter to achieve a reasonable agreement with the observations. In general, neither TST, nor Modified Track Structure Theory (MTST) are able to simultaneously predict the response to 5.3 MeV α-particles and 0.7 MeV protons for all the studied glow curve peaks. Track Interaction Model (TIM) and Unified Track/Defect Interaction Model. (UNIM) calculations of the supralinearity function f(D) of peaks 5 to 8 for 5.3 MeV α-particles and peaks 5 to 9 for 0.7 MeV protons, qualitatively describe the general trends measured in this work; only the UNIM agrees quantitatively with the data in both systems.
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