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Using a sample of 383 million $B\bar{B}$ events collected by the $BaBar$experiment, we measure sums of seven exclusive final states $B\toX_{d(s)}\gamma$, where $X_d$($X_s$) is a non-strange (strange) charmlesshadronic system in the mass range $0.6-1.8$ GeV$/c^2$. After correcting forunmeasured decay modes in this mass range, we obtain a branching fraction for$b \to d \gamma$ of $(7.2\pm 2.7(stat.)\pm 2.3(syst.))\times 10^{-6}$. Takingthe ratio of $X_d$ to $X_s$ we find $\Gamma(b \to d \gamma)/\Gamma(b \to s\gamma) = 0.033 \pm 0.013 (stat.) \pm 0.009 (syst.),$ from which we determine$|V_{td}/V_{ts}|=0.177\pm 0.043$.

Measurement of $B \to X \gamma$ Decays and Determination of $|V_{td}/V_{ts}|$