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Presented by M. Khalid Hossain, a graduate student at Kyushu University and 2021 participant of the ASM Student Speaking Sympoiusm (S3). To learn more about this contest, please visit https://bit.ly/2WXL3WV Proton-conducting oxides are promising materials for electrochemical devices like fuel cell, hydrogen pump, hydrogen sensor, etc., and also for tritium purification and recovery system in nuclear fusion reactors. The hydrogen concentration in such oxide materials is very fundamental and important, but its precise measurement is not easy. Tritium tracer method such as tritium imaging plate (TIP) technique is a powerful tool not only for measuring hydrogen concentration but also for clarifying hydrogen behavior in oxide materials. In this study, hydrogen solubility and diffusivity behavior in three different proton-conducting oxides: BaZr0.9Y0.1O2.95, BaZr0.955Y0.03Co0.015O2.97, and CaZr0.9In0.1O2.95 were studied by the TIP method using a hydrogen-tritium gas mixture (HT) and also partially-tritiated heavy water vapor (DTO) in the temperature range of 623 to 1273 K. These results suggest that a small amount of Y and Co doping in BaZrO3 may play a vital role in the enhancement of its electrochemical activity.