Optical Response of Metakaolin after Ultraviolet and High Energy Electron Exposure

Table 1

SCEPTRE test conditions.

Time of exposure	1096 hrs
Solar environment
UV source (2500 W xenon arc lamp)	2.75 EUVS, (200–400 nm); 3014 ESH
VUV source (150 W deuterium lamp)	20 EuVS (115–400 nm); 2800 ESH
Electron flux
1 keV electron flux	3𝐸9 e−/cm^2/sec
10 keV electron flux	6𝐸9 e−/cm^2/sec
Electron fluence after exposure time	3.2𝐸16 e−/cm^2
Other exposure test environmental values
Inner specimens	75–120°C
Outer specimens	110–160°C
Vacuum pressure	2.3𝐸−7 Torr