## 3 Results and Discussion  
The elemental composition obtained by SEM-EDS is given in Table 2. It shows that C, O, Al, Si, K, Ca, Ti, and Fe were detected in every sample, while Na, Mg, S, Cl, and Zn were present in some samples. The average composition is given in Figure 4. The contents of trace elements analyzed by PIXE including Sc, V, Cr, Mn, Co, Ni, Cu, Zn, Ga, and Zr are shown in Table 3. \begin{table}
\begin{tabular}{c c c c c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Sample**} & \multirow{2}{*}{**Layer**} & \multicolumn{10}{c}{**Elemental Composition (wt\%)**} \\ \cline{3-14}  & & **C** & **O** & **Na** & **Mg** & **Al** & **Si** & **S** & **P** & **Cl** & **K** & **Ca** & **Ti** & **Fe** \\ \hline MB051 & a & 2.41 & 50.30 & 0.13 & 0.14 & 7.03 & 37.19 & N/A & 0.29 & N/A & 0.25 & 0.38 & 0.40 & 1.47 \\  & b & 3.21 & 51.14 & N/A & 0.12 & 5.76 & 37.11 & N/A & 0.64 & N/A & 0.24 & 0.43 & 0.34 & 1.01 \\  & c & 7.03 & 49.54 & 0.16 & 0.15 & 6.59 & 34.22 & N/A & 0.21 & N/A & 0.23 & 0.28 & 0.38 & 1.20 \\ MB052 & a & 5.59 & 54.60 & N/A & 0.12 & 7.17 & 27.10 & N/A & 0.15 & N/A & 0.20 & 0.58 & 0.40 & 3.70 \\  & b & 2.88 & 53.07 & N/A & N/A & 7.06 & 32.92 & N/A & 0.53 & N/A & 0.24 & 0.74 & 0.45 & 1.57 \\  & c & 5.60 & 52.42 & 0.12 & N/A & 7.22 & 31.93 & N/A & 0.40 & N/A & 0.18 & 0.67 & 0.42 & 1.04 \\ MB054 & a & 1.30 & 52.72 & 0.15 & N/A & 5.92 & 36.39 & N/A & 0.46 & N/A & 0.51 & 0.94 & 0.43 & 1.20 \\  & b & 3.49 & 52.08 & 0.11 & 0.08 & 5.97 & 36.04 & N/A & 0.15 & N/A & 0.32 & 0.77 & 0.22 & 0.76 \\  & c & 10.08 & 48.26 & 0.26 & 0.22 & 5.91 & 29.17 & N/A & 0.11 & N/A & 1.06 & 0.74 & 0.26 & 0.92 \\ MB055 & a & 1.73 & 49.25 & 0.14 & N/A & 4.34 & 41.63 & N/A & 0.30 & N/A & 0.79 & 0.60 & 0.31 & 0.90 \\  & b & 2.50 & 50.50 & 0.19 & 0.10 & 5.07 & 38.81 & N/A & 0.31 & N/A & 0.69 & 0.60 & 0.26 & 0.97 \\  & c & 3.73 & 51.95 & 0.18 & N/A & 5.55 & 36.08 & N/A & 0.24 & N/A & 0.61 & 0.53 & 0.24 & 0.89 \\ MB056 & a & 4.05 & 55.28 & N/A & N/A & 6.20 & 25.21 & N/A & 3.78 & N/A & 0.37 & 1.15 & 0.31 & 3.65 \\  & b & 3.41 & 51.06 & N/A & N/A & 5.27 & 36.95 & N/A & 0.75 & N/A & 0.33 & 0.63 & 0.36 & 1.24 \\  & c & 8.69 & 49.28 & 0.13 & 0.16 & 5.03 & 32.54 & N/A & 1.28 & N/A & 0.43 & 0.75 & 0.34 & 1.38 \\ MB058 & a & 5.15 & 51.86 & 0.12 & N/A & 6.16 & 33.33 & N/A & 0.46 & N/A & 0.50 & 0.84 & 0.57 & 1.01 \\  & b & 3.02 & 51.19 & N/A & N/A & 6.11 & 36.63 & N/A & 0.28 & N/A & 0.42 & 0.70 & 0.49 & 1.15 \\  & c & 14.33 & 46.06 & 0.11 & 0.12 & 6.37 & 28.89 & N/A & 0.95 & 0.13 & 0.49 & 0.83 & 0.56 & 1.16 \\ MB059 & a & 5.92 & 52.86 & N/A & 0.15 & 4.95 & 32.20 & N/A & 0.63 & 0.09 & 0.55 & 1.68 & 0.34 & 1.25 \\  & b & 1.92 & 50.96 & N/A & 0.12 & 5.16 & 39.18 & N/A & 0.18 & N/A & 0.56 & 0.69 & 0.34 & 0.89 \\  & c & 2.45 & 51.31 & 0.14 & 0.11 & 4.70 & 38.27 & N/A & 0.57 & N/A & 0.50 & 0.83 & 0.30 & 0.81 \\ MB060 & a & 2.95 & 53.74 & N/A & 0.20 & 7.21 & 32.77 & 1.11 & N/A & 0.11 & 0.46 & 0.85 & 0.27 & 1.34 \\  & b & 1.21 & 52.20 & 0.12 & 0.14 & 7.22 & 36.03 & N/A & N/A & N/A & 0.59 & 0.59 & 0.33 & 1.07 \\  & c & 10.82 & 46.47 & N/A & 0.19 & 38.7 & 35.56 & N/A & 0.32 & 0.09 & 0.28 & 1.02 & 0.33 & 0.55 \\ Average & a & 3.64 & 52.58 & <0.14 & <0.16 & 6.13 & 33.23 & <1.11 & <0.87 & <0.10 & 0.46 & 0.88 & 0.38 & 1.82 \\  & b & 2.35 & 51.79 & <0.14 & <0.12 & 6.15 & 36.05 & <0.10 & <0.41 & <0.10 & 0.47 & 0.60 & 0.36 & 1.17 \\  & c & 7.85 & 49.42 & <0.16 & <0.14 & 5.66 & 33.34 & <0.10 & 0.51 & <0.11 & 0.48 & 0.71 & 0.36 & 1.00 \\ \hline \hline \end{tabular} N/A denotes no detection of element or beyond limit of detection of SEM-EDS (<0.10 wt\(\%\)).  
\end{table} 
Table 2: Elemental composition of the burial potsher samples collected from Ban Muang Bua probed by SEM-EDS in (a) outer layer, (b) core, and (c) inner layer. Figure 4: Average elemental composition of samples analyzed by SEM-EDS for (**a**) outer layer, (**b**) core, and (**c**) inner layer. Ca (\(\sim\)0.28-1.68 wt%) and K (\(\sim\)0.18-1.06 wt%) were also detected. Detection of other elements reflected the same area of production of potteries where the clays were procured.