Abstract
The relative biological effectiveness of mesons ( mu /sup -/) and Co/sup 60/ gamma rays in inducting somatic mutation in staminal hair cells of a diploid clone (02) derived from a variety of Tradescantia occidentalis was investigated. Eight fluorescences were exposed in air in the muon beam for each of the periods of time---2, 4, 6, 8, andd 10 hr. As a standard for the muon treatments, influorescences were exposed in air at a dose rate of 7.5 rads/hr to four doses of Co/sup 60/ gamma rays: 30, 48.7, 71.2, andd 120 rads. Mutations were scored in the staminal hairs of flowers emerging on four successive days and the data relating yield per flower, to dose in rads, fitted to linear, y = k + alpha D, and quadratic, y = k plus or minus alpha D + BETA D/sup 2/, regressions. In all instances linear regressions better fitted the data. The RBE of muons: gamma is given by the ratio of the alpha coefficients, and has a mean value for all days of 0.79. (P.C.H.)
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