A useful technique of scintillation spectrometry developed in this laboratory—that of growing crystals containing radioactive nuclei—was employed to measure the $L$-capture to $K$-capture ratio in the orbital electron capture occurring in ${\mathrm{Cd}}^{109}$ and ${\mathrm{I}}^{125}$. Marshak's formulas were used to calculate the energy of the transition. The $L$-capture to $K$-capture ratio and the energy of the transition are reported as 0.28±0.03 and ${73}_{-6\mathrm{}}^{+12\mathrm{}}$ kev for ${\mathrm{Cd}}^{109}$, and 0.23±0.03 and ${108}_{-10\mathrm{}}^{+20\mathrm{}}$ kev for ${\mathrm{I}}^{125}$, respectively.

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