Neutron doses at 0.43 MeV and at a lower average energy level were plotted against x-ray doses required to produce equal effects in various frequencies of response for eight somatic aberrations found in Tradescantia stamen hairs. Such plots serve as a useful graphic method for expressing RBE values which change as a function of absorbed dose. It was found that the relationship of neutrons of either energy to x-rays for equal irradiation effects changed as a simple power function and, therefore, was linear on log-log plots. The power functions were interpreted as resulting from increased effectiveness of x-rays compared to neutrons as the dose increased. Seven types of somatic aberrations shared the same power function and may thus be produced by radiation acting similarly on a common entity, i.e., the chromosomes or constituent DNA molecules. An eighth type of aberration appeared to be fundamentally different from the others.