The Technological Enhancement of Normally Occurring Radioactive Materials in Red Mud due to the Production of Alumina

Figure 2

Comparison in the gamma energy range 120 to 380 keV showing the photopeaks for Ac-228 (128.7 keV), composite U-235 and Ra-226 (185.71 keV and 186.21 keV), Ac-228 (209.39 keV), composite Ra-224 and Pb-212 (241 keV and 241.91 keV), Pb-214 (295.17 keV), Ac-228 (338.42 keV), and Pb-214 (351.9 keV) in red mud (red spectrum) and alumina (blue spectrum). Counts on vertical axis are in 10⁴.