It is reported that contaminants outgassed from these organic materials cause to degree the performance of optical systems mounted on spacecraft in orbit. We have been focusing on photocatalysts to solve this contamination problem. In this paper, photocatalytic activities of TiO2 in vacuum were measured from frequency change of QCMs. The QCM frequencies increased during UV irradiation to TiO2 on the QCM contaminated by oleamide and MR, which implied that TiO2 can decompose oleamide and MR and their mass on TiO2/QCM decreased in vacuum. We have succeeded to estimate photocatalytic activity from mass change. Moreover, this estimation method is effective to evaluate photocatalytic activity in vacuum.
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