>The whole thing will work in irradiated area, so there is a need
>for memory errors detection and refreshing the memory contents,
>when it's getting corrupted

What sort of radiation level?

Instruments on space craft these days routinely use flash memory for the on
board processors, and these can be suitably shielded to 100k and 300k Rad
levels. This shielding includes the aluminium box, and if necessary a
tantalum metal piece is glued onto the most sensitive chips.

It may be that you will need to talk to chip manufacturers to get the
specifics of what level and type of radiation they can withstand.
Essentially if a chip is using 0.25 micron or finer geometry it will be
inherently radiation proof to a significant level.

If you are outside the USA, and attempting to get chips that are stated as
radiation proof then you will have to complete an End User Agrrement so the
US Government can sign off exporting items they consider of strategic
importance for export. No chip manufacturer will risk sending you anything
without this being signed off by appropriate folks in the US State
Department.

If you have access to anyone in a Space Science department at a University
or elsewhere doing hardware then it is probably worth getting in touch with
them. People involved with Physics Resaearch may also be able to help you,
where they have built detectors for particle accelerators and the like, but
I get the feeling that this is the area you are dealing with.

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