Supralinear response and efficiency of LiF:Mg,Ti to 0.7, 1.5 and 3 MeV protons

Alpha particle and proton relative thermoluminescence efficiencies in LiF:Mg,Cu,P:is track structure theory up to the task?

“…In LiF:Mg,Ti , typical values of h a,g for 4-5-MeV alpha particles are 0.1-0.2, which indicates a reduction in the values of h a,g of a factor of 2 -4 for LiF:MCP. The value of h pg ¼0.15 for 1.5-MeV protons is a factor of 2 smaller than the value of 0.32 in LiF:Mg,Ti (17) similar to the observed reduction in h a,g .…”

“…Although reasonable agreement between experiment and theory was reported, the lack of a glow curve deconvolution capability in the 1980s did not allow the isolation of peak 5 from the very complicated glow curve structure at high levels of dose, which, along with the extrapolation of D(r) from the gas phase to the condensed phase, casts some doubt on the accuracy of these results and the validity of the 'reasonable agreement'. Typical recently measured values for HCP relative TL efficiencies using glow curve analysis are 0.074 and 0.174 for 3 and 7.5 MeV alpha particles (16) and 0.22, 0.32 and 0.53 for 0.7-, 1.5-and 3-MeV protons, respectively (17) . Due to the increasing importance of various modes of charged particle therapy and the relevance to radiation protection in space, a recent review of experimental data in these and other TL materials is also available (18) .…”

TLD-100 thermoluminescent efficiencies for low-energy ions: correlation of efficiency with ion incident energy

“…From figures 10 and 11 it can be observed that distinct curves are found for each ion species. Data obtained for protons agree with previous measurements of our group [12] within the uncertainty values. For 1 H and 4 He ions, all incident on the LiF dosemeters with energies greater than the Bragg peak energy, the measured efficiency values decrease with increasing LET, in agreement with previous data reported in the literature [1].…”

“…These results are shown in figure 10 as a function of the average LET in water, together with MTST calculated efficiencies. Solid symbols represent measurements performed in the present work whereas open symbols represent data previously reported by our group [12][13][14]. Solid lines (D) for the total signal and peak 5 of 8.1 keV x-rays in TLD-100 [8].…”

“…Glow curve analysis for each HCP and energy was performed for peaks 3, 4, 5, 6a, 6b, 7, 8, 9 and 10. The parameters used for 1 H, 4 He and 12 C ions were consistent with those used in previous studies [12][13][14][15]. For 14 N and 16 O ions the initial parameters were taken as those of C ions [15] and the glow curve analysis was performed following two or three stages.…”