Title: Calculation of thallium hyperfine anomaly,
Abstract: We suggest a method to calculate hyperfine anomaly for many-electron atoms
and ions. At first, we tested this method by calculating hyperfine anomaly for
hydrogen-like thallium ion and obtained fairly good agreement with analytical
expressions. Then we did calculations for the neutral thallium and tested an
assumption, that the the ratio between the anomalies for $s$ and $p_{1/2}$
states is the same for these two systems. Finally, we come up with
recommendations about preferable atomic states for the precision measurements
of the nuclear $g$ factors.