Hi Suresh,
We are not aware of the ADG706 or ADG726 ever being used for a space level application.
The ADG706 and ADG726 are fabricated on a 0.60um CMOS process. Based on radiation test data from other devices fabricated on the same 0.60um CMOS process we would expect the devices to be radiation sensitive and not sufficiently radiation tolerant for space level applications.
A layer of Tantalum tape will NOT prevent any damage to the devices from high energy particles. There is no way to shield against single event effects.
Regards,
Stephen