The electromagnetic spectrum resulting from the decay of ${\mathrm{Tm}}^{170}$ has been examined on a ten-inch bent-crystal spectrometer. One gamma ray, seven $K$ x-rays, and one $L$ x-ray were observed. The presence of Er $K$ x-ray was established and shown to be due to a 0.15% $K$-capture branch in the decay of ${\mathrm{Tm}}^{170}$. The energy of the first excited state of ${\mathrm{Yb}}^{170}$ was found to be 84.229±0.041 kev. The reflectivity of the bent-topaz crystal used in the spectrometer was found to obey the function ${\left(\frac{1}{E}\right)}^{1.35\pm 0.05}$.

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