What do A pos and C pos mean?
The # column is the rank of each listed entry for Applied Radiation and Isotopes — rank 1 means this entry is where Applied Radiation and Isotopes has the most articles or citations. A pos and C pos show the reciprocal: the position of Applied Radiation and Isotopes within that entry's own ranked list, by articles and citations respectively. A low value means Applied Radiation and Isotopes is among the most prominent contributors for that entry.