The internal conversion electron and Mossbauer isomer shifts associated with the 35.46 keV M1 transition of125Te were observed for different metal samples into which radioactive125I as probe atoms were introduced by means of ion-implantation. From the correlation between the Mossbauer isomer shifts and intensity ratios of O shell to NI shell conversion electrons, a relation between 5s-electron contact densityp5s(0) in a.u. and isomer shift δ in mm/s was deduced to bep5s(0)=106+30.3 δ±4.3[(δ−0.30)2+0.069]1/2, where δ was measured relative to ZnTe in mm/s. The change of the nuclear charge radius in the 35.46 keV M1 transition of125Te was found to be ΔR/R=(0.85±0.12)×10−4 (corresponding to Δ =(3.7±0.5)×10−3 fm2) when a theoretical 4s-electron contact density of 928 a.u. was used.