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'[EE]: Hard radiation performance of two AVR microp'
2002\08\16@060737 by Russell McMahon

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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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2002\08\16@073051 by Dominic Stratten

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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 removed}

2002\08\16@074323 by Hazelwood Lyle

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I would think that a microwave would be a "day at the beach" for
microprocessors or microcontrollers. 8^)
Especially if they brought a micro surfboard.

>{Original Message removed}

2002\08\16@080210 by Alan B. Pearce

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>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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2002\08\16@090231 by Russell McMahon

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> 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.

How well shielding works depends very much on particle energies. Cobalt 60
is about as bad a gamma emitter as you would normally encounter and requires
1.5cm of lead to halve the intensity whereas something like americium needs
only about 0.01mm.

A rather good but disturbing Radiation Safety Training Manual

       http://www.ehs.ucsf.edu/Manuals/RSTM/TableOfC.htm

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2002\08\16@111108 by Dave Tweed

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Dominic Stratten <spam_OUTsalesTakeThisOuTspamPICBITS.COM> wrote:
> Mmmmmmmm - wonder how many people have just stuck their Pic's in the
> microwave to see what happens ;-)

Different issue altogether; microwaves are not ionizing radiation.

In a microwave oven, you'd be finding out the effects of heating and
induced GHz currents.

-- Dave Tweed

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2002\08\16@113848 by Scott Touchton

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Actually, I have seen this done many times!!!

While working at IFCO, dealers wanted to return product that was perfectly
good.  If they did so, they got charged.  So they got smart.  Started
sticking the dog collars in the uwave.  Blew the tops off of them exposing
the die.  Might have been due to trapped moisture.

(after I left the company, some of the local dealers confessed)
{Original Message removed}

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