THE CRITICAL ONSET OF RADIATION INDUCED CONDUCTION IN HYDRATED BIOPOLYMERS AT ELEVATED WATER CONTENTS AND SUBZERO TEMPERATURES D. van LITH, J. EDEN, J.M. WARMAN, M.P. de HAAS and A. HUMMEL J. Phys. Colloques, 48 C1 (1987) C1-645 DOI: 10.1051/jphyscol:1987190