γ-ray and internal-conversion intensity studies of transitions in the decay ofTh228

High resolution intensity studies have been made of the 115, 239, and 300 keV transitions in ${}_{}{}^{212}{}_{}{}^{}\mathrm{Bi}$, the 252, 277, 511, 583, 722, 763, and 860 keV transitions in ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$, the 288, and 453 keV transitions in ${}_{}{}^{208}{}_{}{}^{}\mathrm{Tl}$, and the 727 and 785 keV transitions in ${}_{}{}^{212}{}_{}{}^{}\mathrm{Po}$, using carefully intensity-calibrated Ge(Li) and Si(Li) detectors. Twenty-four $K$-, $L$-, and $M$-shell internal-conversion coefficients were derived from the data and multipole mixing parameters $\left|\delta \right|$ and mixing percentages were deduced.