The ρ- radiative decay width has been measured by studying the production of ρ- via the Primakoff effect by 200 GeV incident π- on Cu and Pb targets. This width was obtained by fitting the measured dσ/dt for ρ production with the theoretical coherent differential cross section including both the electromagnetic and strong contributions. The measured radiative width value is 81 +/- 4 +/- 4 keV: it is consistent with the ratio Γ(ρ --> πγ)/Γ(ω --> πγ) ~ case:1/9 as expected from the vector dominance and the quark model.
