This useful report from the U.S. Department of Energy Office of Scientific and Technical Information (OSTI) gives an overview of the effects of ionizing radiation on optical materials that may be used in spacecraft sensors. It introduces the relevant phenomena and indicates where more detailed information can be found. The topics covered include radiation induced absorption in ultraviolet transmitting materials, ordinary optical glasses, cerium stabilized optical glasses, and infrared transmitting materials; bleaching and annealing, and radioluminesence.
Further Information: https://www.flowmeters.co.uk/atrato-ultrasonic-flowmeters/