During immersion testing of an ASTM Ultrasonic Standard Reference Block, a B-scan presentation system will show a:

• A. Cross section of the reference block, showing the top and bottom surfaces of the block and the location of the hole bottom in the block
• B. Plan view of the block, showing the area and position of the hole bottom as seen from the entry surface
• C. Basic test pattern showing the height of indication from the hole bottom and its location in depth from the entry surface
• D. None of the above

Answer: (A)

In immersion ultrasonic testing, a B-scan provides a cross-sectional image along the scan line, converting time-of-flight into depth to show how the part looks along that path. For an ASTM Ultrasonic Standard Reference Block, this means you get a side view that includes the block’s top surface where the probe enters, the bottom surface of the block, and the location of the hole bottom within that cross-section. This cross-sectional representation lets you see both the overall geometry and where the internal feature sits in depth relative to the entry surface.

The other views described don’t match how a B-scan is displayed. A plan view shows a top-down layout rather than depth along a line, and a basic pattern showing height of an indication versus depth corresponds more to an A-scan at a single point, not a cross-sectional image. Therefore, the cross-section showing the top and bottom surfaces and the hole bottom’s position is the correct depiction.