Fermilab-Tevatron. Measurement of the ratios of cross section for B-JET to JET production in association with a Z0 boson in antiproton-proton interactions at a centre of mass energy of 1.96 TeV. The data, with an integrated luminosity of 9.7 fb-1, is presented as functions of the jet and Z0 transverse momentum, the jet pseudorapidity and the azimuthal angle between the Z0 and the closest jet. Events must have at least one jet with jets being reconstructed from energy deposits in the calorimeter using an iterative mid-point cone algorithm with delta R = 0.5. Events are rejected if the missing ET is > 60 GeV to reduce t-tbar contamination.