>What's an ELMB (Embedded Local Monitor Board)

 >       http://atlasinfo.cern.ch/ATLAS/GROUPS/DAQTRIG/DCS/ELMB/


This sounds like a sensor monitor that would be mounted on the accelerator
ring. It will be subject to radiation at this point, hence the radiation
requirements. These accelerator rings have an amazing number of sensors
around them, and so local data collection and monitoring, with a data bus
back to the control room is a major requirement, just to keep cabling down
to a manageable level.

>- Enough radiation kills them in the end.

Yeah, not surprising :)))


>Source was Gamma radiation from Cobalt 60 with dose accumulated
>in less than an hour
>Maximum exposure was ~= 80 Gray (Gy)
>1 Gy = 100 Joule/kg = 100 rads.

That is about the normal exposure rate using a Cobalt 60 source. For testing
components to use on space craft we had some items tested, and it took
something like 12 hours, which represented around 100k rad.

For space use we are looking at using devices resistant to 300k rad for low
earth orbit, and expect the instrument lifetime to be something like 5
years. However the radiation does get tempered by being in an aluminium case
which does some shielding.

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