David, That is a pretty broad question. For the most part, the high energy gamma radiation degrades polymers by chain scission, or cutting up the polymer chains. NASA has a fair amount of data. Try this link which is a quick Google Search. It shows some promising leads. http://www.google.com/search?hl=en&q=NASA+%22gamma+radiation%22+%22effects+on+electronics%22&aq=f&oq= Doug Pauls Rockwell Collins David Baldwin <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 11/10/2008 03:46 PM Please respond to TechNet E-Mail Forum <[log in to unmask]>; Please respond to David Baldwin <[log in to unmask]> To [log in to unmask] cc Subject [TN] Gamma Radiation Effects on Assemblies? DC Members: I have designed a flex assembly that will be subject to gamma radiation (25-50 kGy) for sterilization purposes. We need to know the effects of this radiation on the materials; Active & passive comps, polyimid flex, solder & joints, etc... Can anyone point me in the right direction where I might begin to find this information? Is there an overall document and specification? Would I need to contact the manufacturer of each P/N and request this information. I have done flight boards in which each component had to be rad-hard, is this a similar situation? Thanks in advance! David Baldwin CID+ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------