The method for acquiring data was done using the following three sources (energies ranging from 81 to 1275 keV): , , and . The selected temperatures used were 16, 30, 40, 50, and 60°C. Counts from each source were collected for five consecutive runs at each temperature with the exception of at 40 and 60°C. In the case of 40°C, there are only two runs recorded, and in the case of 60°C, there are only four. Each spectrum of the and sources was acquired for 300 s, while to achieve good statistics, the spectra were recorded for 900 s.