[en] The yield of repciprocial translocations (RT) in spermatogonia of rats after irradiation with 9 GeV protons, 4 GeV helium ions and gamma rays from ⁶⁰Co is investigated. Higher dose (4 Gy) has been used only for protons. The cytogenic analysis shows lower yield of RT compared to irradiation with 3 Gy. The yield/dose (Y/D) correlation in all three types of radiation is described as linear in the dose range 0.5-3 Gy: Y=0.04+(2.84±0.24)D - for 9 GeV protons, Y=0.20+(2.37±0.09)D - for 4 GeV helium ions and Y=0.02+(1.58±0.3)D - for gamma-rays. The relative biological effectiveness determined on the base of these equations is 1.8 for protons and 1.5 for helium ions. 1 fig., 1 tab., 19 refs