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Fig. 1
Representative natural OSL and thermally assisted OSL (TA – OSL) signals corresponding to the CaCO3 sample with code SB3. These signals are not useful for dating applications.
Fig. 2
Typical results of the MAAD plateau method applied for sample SB1. Plot (a) presents a NTL glow curve (as an average of three independently measured glow curves), plot (b) presents the representative Si curves for a selection of additive doses according to equation (2) while plot (c) presents an ED plateau versus glow curve temperature according to equation (1). Error bars correspond to 1σ.
Fig. 3
Representative deconvolution analysis of a TL glow curve corresponding to the sample SB1, after a dose of 450 Gy (open data points). Six different TL glow peaks and a black body radiation curve (BGK) were used in order to fit the experimental glow curve. Each TL glow peak is presented in solid line and is denoted as Pi. Orange solid line indicates the fitting curve. Table 2 indicates the activation energies of the TL peaks.
Fig. 4
Representative additive dose growth curve in terms of the integrated intensity of TL glow peak P4 after deconvolution, for the sample with code SB1. The arrow indicates the ED value.
Data related to the ED estimation for all four samples.
A/A
Sample Codes
Plateau ΔT (°C)
Plateau ED (Gy)
P4 ED (Gy)
P5 ED (Gy)
P6 ED (Gy)
1
SB1
270–370
1258 ± 155
1578 ± 171
1312 ± 137
1422 ± 158
2
SB2
280–385
1458 ± 166
1682 ± 149
1489 ± 155
1358 ± 185
3
SB3
260–380
1077 ± 91
1236 ± 133
1113 ± 107
1193 ± 128
4
SB4
270–380
781 ± 70
932 ± 98
812 ± 86
850 ± 88
Deconvolution results for fitting parameters of all four samples.
A/A
Sample Codes
P4 Tmax (°C)
P4 R
P4 E (eV)
P5 Tmax (°C)
P5 R
P5 E (eV)
P6 Tmax (°C)
P6 R
P6 E (eV)
1
SB1
328 ± 4
0.06
1.34 ± 0.12
399 ± 11
0.09
1.59 ± 0.18
453 ± 22
0.01
1.81 ± 0.21
2
SB2
326 ± 5
0.04
1.37 ± 0.11
402 ± 10
0.05
1.63 ± 0.17
457 ± 21
0.01
1.86 ± 0.19
3
SB3
328 ± 3
0.09
1.34 ± 0.13
404 ± 13
0.07
1.64 ± 0.16
463 ± 22
0.02
1.88 ± 0.24
4
SB4
327 ± 5
0.05
1.41 ± 0.12
402 ± 13
0.05
1.61 ± 0.17
459 ± 24
0.01
1.79 ± 0.20
Content of main elements. The detection limit for the (%) concentration is 0.01%. BDL=Below Detection Limits.