Post by thread:OTP erasure

Message-Id: 13963_ha5kfu From: ha5bwh@ha5kfu.#bp.hun.euro (Istvan, Retaller) To: spam_OUTpiclistTakeThisOuTmitvma.mit.edu Hi, everybody! Anyone has experience with re-utilizing OTP devices programmed accidentally with wrong content? I tried to clean them by x-ray radiation with the help of my friend, who served at a hospital at the technical staff. Later I realized that the programmer I used to check to see the result, had contact problems. Perhaps was a point when doses were good, but later was risen to a level harmful for crystal structure...? The source was cobalt, but the doses...? I don't remember. Stephen

On Mon, 20 Apr 1998 22:59:51 +0000 "Istvan, Retaller" <.....ha5bwhKILLspam@spam@HA5KFU.SCH.BME.HU> writes: > Perhaps was a point when doses were good, but later was >risen to > >a level harmful for crystal structure...? The source was cobalt, but >the > >doses...? I don't remember. All the reports I've heard are that exposure to X-rays or gamma rays will erase OTP devices, but also damage them at about the same time. There is no (reliable) way to re-use them. _____________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com Or call Juno at (800) 654-JUNO [654-5866]

At 12:44 AM 4/21/98 -0400, you wrote: >On Mon, 20 Apr 1998 22:59:51 +0000 "Istvan, Retaller" ><ha5bwhKILLspamHA5KFU.SCH.BME.HU> writes: > >> Perhaps was a point when doses were good, but later was >>risen to >> >>a level harmful for crystal structure...? The source was cobalt, but >>the >> >>doses...? I don't remember. > >All the reports I've heard are that exposure to X-rays or gamma rays will >erase OTP devices, but also damage them at about the same time. There is >no (reliable) way to re-use them. I am no expert on radioactive materials, but I don't think that cobalt emits X-rays in the same frequency range as, say, an x-ray machine. I think they are MUCH harder (gamma rays). Maybe softer x-rays would be more likely to cause erasure without crystal damage? Sean +--------------------------------+ | Sean Breheny | | Amateur Radio Callsign: KA3YXM | | Electrical Engineering Student | +--------------------------------+ Fight injustice, please look at http://homepages.enterprise.net/toolan/joanandrews/ Personal page: http://www.people.cornell.edu/pages/shb7 .....shb7KILLspam.....cornell.edu Phone(USA): (607) 253-0315