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DrQuine
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Re: Medical Devices Tolerating Cremation or Accidents
DrQuine   9/6/2014 5:51:47 PM
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@goafrit My comment must have been unclear. The embedded plutonium in a working pacemaker device is perfectly safe for the patient and for the surrounding environment.  The concern was that a severe accident or cremation could breach the container and release free plutonioum into the environment which would be a serious issue.

goafrit
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Re: Medical Devices Tolerating Cremation or Accidents
goafrit   9/6/2014 4:43:11 PM
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>> While the dead patient wouldn't care, the release of plutonium into the environment during cremation was a serious concern.

That is interesting that someone can have that while alive. Then on death, the toxicity level could harm others. This calls for the need to think through materials before they are deployed in products.

DrQuine
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Medical Devices Tolerating Cremation or Accidents
DrQuine   7/23/2014 9:49:37 AM
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Another challenging issue is the need for medical devices to tolerate cremation (or accidents) without releasing toxic materials even after the patient dies. In the instance of plutonium powered heart pacemakers this was a serious issue. While the dead patient wouldn't care, the release of plutonium into the environment during cremation was a serious concern. Physical shielding accounted for a significant portion of the bulk of the device.

resistion
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Re: Choice of radiation for sterilization
resistion   7/9/2014 11:02:15 PM
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Floatiing gate is not radiation hard, it would be used with radiation shields.

goafrit
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Re: Choice of radiation for sterilization
goafrit   7/9/2014 8:50:16 PM
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>>  I have heard of radiation hardened FPGAs being used but do not have much idea about the memory.  

You go with floating gates memory. I have seen that being adopted for most space-focussed memory designs. That can be used here.

goafrit
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Re: Choice of radiation for sterilization
goafrit   7/9/2014 8:48:22 PM
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>>  And that radiation has to be cheaply provided

My experience in the medical device is that the components command good premium compared to the consumer market. So, this can be done. I know for example in MEMS, you can sell a unit of XL for $60 compared with $0.60 you can get in the consumer market.

y_sasaki
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MEMS memory?
y_sasaki   7/9/2014 6:19:44 PM
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I remember I've read article on Scientific American IBM at that time was investigated MEMS memory - essentially atomic-size abacus. I never heard what happend to that technology, probably dead-ended. Sad, if they've kept the development, it could be highly tolerant to radiation memory.

resistion
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Re: Choice of radiation for sterilization
resistion   7/9/2014 11:37:13 AM
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Yes one needs radiation-hard CMOS to control radiation-hard memory. How do the sterilized devices use memory or even CMOS now?

Sanjib.A
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Re: Choice of radiation for sterilization
Sanjib.A   7/8/2014 11:38:07 PM
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@resistion: You have made an excellent point!! If there is a way to control the radiation such that the radiation serves its purpose without damaging the semiconductor while keeping the cost lower than what it would be with the CBRAMs, that should make the case for it. 

Are the CBRAMs equivalent to FLASH functionally? Currently what kind of memory chips being used in space equipments, for which the radiation threats are similar? I have heard of radiation hardened FPGAs being used but do not have much idea about the memory.  

resistion
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Choice of radiation for sterilization
resistion   7/8/2014 9:44:46 PM
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If the purpose is sterilization, you have to choose a radiation that kills the germs without killing the CMOS. And that radiation has to be cheaply provided. Generally the thinner the memory layer the less likely the radiation would deposit damaging energy.



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