Mmmmmmmm - wonder how many people have just stuck their Pic's in the
microwave to see what happens ;-)

You could have started off something dangerous now Russel - he he he.


----- Original Message -----
From: "Russell McMahon" <apptech@PARADISE.NET.NZ>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, August 16, 2002 11:06 AM
Subject: [EE]: Hard radiation performance of two AVR microprocessors & a CAN
controller


> Report on performance of two microcontrollers and a CAN bus controller
after
> exposure to varying levels of ionising radiation
>
>
> http://atlasinfo.cern.ch/ATLAS/GROUPS/DAQTRIG/DCS/ELMB/resultspagure1.pdf
>
> This is a report from CERN about the performance of electronic equipment
> they use within their "ATLAS" system when exposed to ionising radiation.
It
> may be of interest in that it provides both qualitative and quantitative
> information about operation and failure modes in an ionising radiation
> environment.
>
> The report proper is a 10 page pdf. The ICs tested were an AVR AT90S2313,
> AtMega103L and SAE81C91 (Infineon CAN Bus controller).
>
> Rough summary is:
>
> - Current drain increased appreciably with exposure (factor of 10 x in
mega
> at 85 Gy)
>
> - Point was reached where Flash memory would not erase (Mega) but cpu
still
> worked 100% and memory still read OK. With 2313 flash would erase but
would
> not reprogram but CPU still worked 100% at this point.
>
> - Enough radiation kills them in the end.
>
> 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.
> (REM and RAD are related by a quality factor which varies with the
radiation
> type. In this case one can probably say that 80 Gy ~= 8000 rem = 1600
years
> exposure to background radiation).
> A person exposed to a dose of this level would die in a few weeks.
>
>
>
>
>
> What's an ELMB (Embedded Local Monitor Board)
>
>         http://atlasinfo.cern.ch/ATLAS/GROUPS/DAQTRIG/DCS/ELMB/
>
>
> http://atlasinfo.cern.ch/ATLAS/GROUPS/DAQTRIG/DCS/ELMB/SB/elmb_5.html
>
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>

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