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ULTRASAT (ULtraviolet TRansient Astronomy SATellite) is a wide-angle spacetelescope that will perform deep time-resolved surveys in the near-ultravioletspectrum. ULTRASAT is a space mission led by the Weizmann Institute of Scienceand the Israel Space Agency and is planned for launch in 2025. The cameraimplements backside-illuminated, stitched pixel sensors. The pixel has adual-conversion-gain 4T architecture, with a pitch of $9.5$ $\mu m$ and isproduced in a $180$ $nm$ process by Tower Semiconductor. Before the finalsensor was available for testing, test sensors provided by Tower were used togain first insights into the pixel's radiation tolerance. One of the maincontributions to sensor degradation due to radiation for the ULTRASAT missionis Total Ionizing Dose (TID). TID measurements on the test sensors have beenperformed with a Co-60 gamma source at Helmholz Zentrum Berlin and CC-60facility at CERN and preliminary results are presented.

Total Ionizing Dose Effects on CMOS Image Sensor for the ULTRASAT Space Mission