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Atomic-scale simulations have been employed to predict the site solution preference of Bi3+ activator cations in a series of RE2O3 scintillators with the bixbyite crystal structure (Ialpha3), where RE denotes a 3+ cation ranging in size from Sc3+ to La3+ . There are two crystallographically unique cation sites in the bixbyite structure, in Wyckoff notation referred to as the 24d and 8b site. It is expected that the spectroscopic properties of an activator cation residing on the 24d site will be different from the same activator cation residing on the 8b site, due to the distinct symmetries (C2 and S6 respectively) of these two sites. Previous studies have revealed two different Bi3+ emissions in Y2O3 corresponding to Bi3+ cations occupying both lattice 24d and 8b sites. By predicting the energy difference of the Bi3+ solution on the 24d and 8b sites, we are able to predict the distribution of Bi3+ in a range of bixbyite compounds.