Thermal neutron capture cross sections and resonance integrals of Ru, Ru and Ru are measured with reference to a Mn monitor. The experiments are carried out using the neutrons from an Am-Be neutron source kept inside a concrete bunker. The thermal neutron capture cross sections measured are in good agreement with the evaluations as well as with one of the recent measurements. The resonance integral of Ru measured in the present study is in good agreement with older measurements.