Forum Technical Discussions      Re: Aggressive Radiographic Auditors Need to Take a Closer Look! Posted by: Nigel Armstrong (PID_728), E-mail: Address, on January 05, 2009 at 14:36 : In Reply to: Re: Aggressive Radiographic Auditors Need to Take a Closer Look! posted by : TJ , E-mail: Address, on January 05, 2009 at 12:29 : Happy and healthy New Year to all NDT.netters. Thanks for the links to sites showing these phenomena Ed - I've not yet explored them but I shall. Intuitively, I had grasped the contrast problem, never really taught at NDT school though. Viewers with in-built adjustable masks are very useful for this. I assume that these effects may lead predominantly to assuming a linear indication exists, in which case the RI tech often calls in a trusted UT tech to see if a reflector exists in the area of concern. Is this a reasonable action or a display of lack-of-confidence on the part of the RI tech? ----------- Start Original Message ----------- : Ed, : After reading the .pdf I now see how this is an issue. The mach bands are of particular interest. I am surprised this was never touched on in training. It will be from now on! : Thanks, : TJ ------------ End Original Message ------------ Follow Ups: Re: Aggressive Radiographic Auditors Need to Take a Closer Look! chris s 18:06 Jan-06-2009 (0) Re: Aggressive Radiographic Auditors Need to Take a Closer Look! chris s 18:06 Jan-06-2009 (0) Re: Aggressive Radiographic Auditors Need to Take a Closer Look! Ed Ginzel 18:00 Jan-05-2009 (1) Re: Aggressive Radiographic Auditors Need to Take a Closer Look! Dent McIntyre 15:27 Jan-06-2009 (0) Post a Followup: Name: E-Mail: Subject: Comments: ----------- Start Original Message ----------- : Happy and healthy New Year to all NDT.netters. : Thanks for the links to sites showing these phenomena Ed - I've not yet explored them but I shall. : Intuitively, I had grasped the contrast problem, never really taught at NDT school though. Viewers with in-built adjustable masks are very useful for this. I assume that these effects may lead predominantly to assuming a linear indication exists, in which case the RI tech often calls in a trusted UT tech to see if a reflector exists in the area of concern. Is this a reasonable action or a display of lack-of-confidence on the part of the RI tech? : : : Ed, : : After reading the .pdf I now see how this is an issue. The mach bands are of particular interest. I am surprised this was never touched on in training. It will be from now on! : : Thanks, : : TJ ------------ End Original Message ------------ Optional Link URL: Example: "http://www....html". Alternative write "http://www.ndt.net/wshop/attach/filename.htm" if you transfered a filename.htm via FTP Page Title: is important! Optional Image URL: http://www....gif Attention! Please click the button only once. This may take a moment to process Forum Technical Discussions Help