## 3 Results and Discussion
### TL, OSL, and IRSL Results
In the literature, [PERSON] et al. (2018) reported a TL emission of kaolinite in the blue region of \begin{table}
\begin{tabular}{l l l l} \hline \hline
**SAMPLE ID** & **g-Value** & **Age Faded** & **Date Faded** \\ \hline Mour-1 (TL) & 6.8 \(\pm\) 0.4 & 630 \(\pm\) 130 & 1390 \(\pm\) 130 \\ Mour-1 (IRSL) & 7.9 \(\pm\) 0.5 & 920 \(\pm\) 220 & 1100 \(\pm\) 220 \\ Mour-2 (TL) & 8.4 \(\pm\) 1.8 & 1010 \(\pm\) 300 & 1010 \(\pm\) 270 \\ Mour-2 (IRSL) & 5.7 \(\pm\) 1.5 & 870 \(\pm\) 250 & 1150 \(\pm\) 250 \\ Mour-3 (TL) & 9.0 \(\pm\) 0.3 & 1170 \(\pm\) 280 & 850 \(\pm\) 280 \\ Mour-3 (IRSL) & 9.8 \(\pm\) 0.3 & 910 \(\pm\) 250 & 1110 \(\pm\) 250 \\ Prat (TL) & 8.6 \(\pm\) 2.1 & 1410 \(\pm\) 390 & 610 \(\pm\) 390 \\ Prat (IRSL) & 9.0 \(\pm\) 0.2 & 1860 \(\pm\) 300 & 160 \(\pm\) 500 \\ Padum (TL) & 3.4 \(\pm\) 0.7 & 1350 \(\pm\) 180 & 670 \(\pm\) 180 \\ Padum (OSL) & 3.3 \(\pm\) 0.6 & 1140 \(\pm\) 360 & 880 \(\pm\) 360 \\ Padum (IRSL) & 9.1 \(\pm\) 0.1 & 1040 \(\pm\) 200 & 980 \(\pm\) 200 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: g-values, ages, and dates corrected for anomalous fading. \begin{table}
\begin{tabular}{l l l l l l l l l l l} \hline \hline \multirow{2}{*}{**SAMPLE ID**} & \multirow{2}{*}{**W (\%)**} & \multirow{2}{*}{**a**} & \multicolumn{2}{c}{**ppm U**} & \multicolumn{2}{c}{**ppm Th**} & \multicolumn{2}{c}{**K\({}_{2}\)O**} & \multicolumn{2}{c}{**E.D. **} & \multicolumn{2}{c}{**Dose Rate**} & \multicolumn{2}{c}{**Age**} & \multirow{2}{*}{**Error**} \\  & & **Value** & (\(\pm\)**\%)** & **(\(\pm\)**\%)** & **(\(\pm\)**\%)** & **(\(\pm\)**3\%)** & **(Gy)** & **(mGy/a)** & **(y)** & **Date** & **Error** \\ \hline Mour1 TL & 18 & 0.14 & 4.1 & 12.9 & 2.98 & 2.2 \(\pm\) 0.3 & 6.9 \(\pm\) 0.3 & 320 & 1700 & 60 \\ Mour-1 IRSL & 18 & 0.14 & 4.1 & 12.9 & 2.98 & 2.6 \(\pm\) 0.8 & 7.5 \(\pm\) 0.3 & 350 & 1670 & 90 \\ Mour-2 TL & 23 & 0.18 & 4.3 & 13.8 & 2.56 & 2.7 \(\pm\) 0.3 & 7.2 \(\pm\) 0.4 & 380 & 1640 & 60 \\ Mour-2 IRSL & 23 & 0.18 & 4.3 & 13.8 & 2.56 the spectrum. Ten years later, it was found that this mineral could potentially be valid for dosimetric purposes since it is sensitive to radiation and possesses a good dose linearity in the range of 50 mGy to 8 Gy [86]. However, the stability of the TL signal during six months of storage shows an initial rapid decay (ca. 60%) followed by a mild slope reaching stability after six months. Moreover, this mineral stands as a very promising candidate for IRSL dating based on the very good IRSL response of this material to artificial beta irradiation [87]. Based on these results and on data obtained using FTIR and XRD analyses that confirm the presence of kaolinite in all the bricks studied, the dosimetric properties of kaolinite were more deeply investigated. Hence, the TL, OSL, and IRSL measurements were carried out on kaolinite coming from Monte Bracco (Barge, CN, Italy). The sample presented luminescence signals either when heated or when illuminated with blue and IR light; Figure 10 shows TL, OSL and IRSL signals when irradiated with a dose from 9 to 92 Gy. There was a linear growth of signal with dose in TL (at least up to 92 Gy), OSL, and IRSL (up to about 37 Gy). At this point, the stability of the TL, OSL, and IRSL signals of kaolinite were investigated. A fading test was performed, and it was noted that the measured luminescence signal (TL, OSL, and IRSL) decreases as the time between irradiation and measurement increases (Figure 11). Unfortunately, it was not possible to determine the g-value for any of the luminescence techniques used as the decay of the luminescence signals does not follow the exponential decay law used for feldspars. The significant loss of luminescent signal over time, however, allows us to identify kaolinite as a possible cause of the high g-values obtained on the bricks analyzed in this work.