ASME V:2006 pdf download NONDESTRUCTIVE EXAMINATION
T-233.2 Alternative IOI Design IQIs designed andmanufactured in accordance with other national or international standards may be used provided the requirementsof either (a) or (b) below, and the material requirements
of T-276.1 are met.(a) Hole Type IOls. The calculated Equivalent IOlSensitivity (EPS),per SE-1025，Appendix X1,is equalto or better than the required standard hole type IQI(b) Wire Type IOls. The alternative wire IOI essentialwire diameter is equal to or less than the required standardIOI essential wire.
Facilities for Viewing of RadiographsT-234Viewing facilities shall provide subdued backgroundlighting of an intensity that will not cause refectionsshadows, or glare on the radiograph that interfere witlthe interpretation process. Equipment used to view radiographs for interpretation shall provide a variable lightsource sufficient for the essential IOl hole or designatedwire to be visible for the specified density range. Theviewing conditions shall be such that light from aroundthe outer edge of the radiograph or coming through lowdensity portions of the radiograph does not interfere withinterpretation.
T-260CALIBRATION
T-261
Source Size
T-2611 Verification of Source Size. The equipmentmanufacturer’s or supplier’s publications, such as technical manuals, decay curves, or written statements documenting the actual or maximum source size or focal spotshall be acceptable as source size verification.
T-261.2 Determination of Source Size. When manufacturer’s or supplier’s publications are not availablesource size may be determined as follows:
(a) X-Ray Machines. For X-ray machines operating at500 kV and less, the focal spot size may be determinedby the pinhole method,’ or in accordance with SE-1165Standard Test Method for Measurement of Focal Spotsof Industrial X-Ray Tubes by Pinhole Imaging.(b) Iridiumn-192 Sources. For Iridium-192, the sourcesize may be determined in accordance with SE-1114Standard Test Method for Determining the Focal Size ofIridium-192 Industrial Radiographic Sources.
T262Densitometer and Step WedgeComparison FilmT-2621 Densitometers. Densitometers shall be calibrated at least every 90 days during use as follows:
(a) A national standard step tablet or a step wedgecalibration film, traceable to a national standard step tabletand having at least 5 steps with neutral densities from atleast 1.0 through 4.0, shall be used. The step wedgecalibration film shall have been verified within the lastyear by comparison with a national standard step tabletunless, prior to first use, it was maintained in the originallight-tight and waterproof sealed package as supplied bythe manufacturer. Step wedge calibration films may beused without verification for one year upon opening, pro-vided it is within the manufacturer’s stated shelf life.(b) The densitometer manufacturer’s step-by-stepinstructions for the operation of the densitometer shallbe followed.
(c) The density steps closest to 1.0, 2.0, 3.0, and 4.0on the national standard step tablet or step wedge calibration film shall be read.