ISOMER SHIFT CALIBRATION OF 129I AND 127I BY LIFE-TIME VARIATIONS IN THE ELECTRON-CAPTURE DECAY OF 123I J. Ladrière, M. Cogneau et A. Meykens J. Phys. Colloques, 41 C1 (1980) C1-131-C1-132 DOI: 10.1051/jphyscol:1980130