Abstract
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\ifmmode\pm\else\textpm\fi{}0.03 and ${73}_{\ensuremath{-}6}^{+12}$ kev for ${\mathrm{Cd}}^{109}$, and 0.23\ifmmode\pm\else\textpm\fi{}0.03 and ${108}_{\ensuremath{-}10}^{+20}$ kev for ${\mathrm{I}}^{125}$, respectively.
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