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

Figure 3

Comparison in the gamma energy range 480 to 640 keV showing the photopeaks for Ac-228 (463.1 keV), Tl-208 (510.77 keV), Tl-208 (583.19 keV), and Bi-214 (609.32 keV) in red mud (red spectrum) and alumina (blue spectrum).