Radiographic Magnification Differences Due To Grid Placement at DARHT
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
In 2015, it became apparent that the radiographic grid, which has been used to calibrate the dimensional scale of DARHT radiographs, was not centered at the location where the objects have been centered along the beamline. Instead of the grid center being placed at 133.0 cm, the grid downstream face was placed at this location, putting the grid center at 132.75 cm. This o set produced an error of 0.188% in the dimensional scaling of the radiographic images processed, using the assumption that the grid and objects had the same center. The Air Force Target (AFT) had the same holder as the grid, while the Circular Resolution Target (CRT) used a holder that correctly placed the object center at 133.0 cm. These erroneous holders were used until October 2015. Starting in November 2015, new holders were used that placed all static target objects in the correct location, with their center at 133.0 cm. This paper will show the derivation of the scaling correction, explain how old radiographs are being processed to account for the difference in location, and provide the details of how to correct radiographic images processed with the erroneous scale factor.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- DOE Contract Number:
- 89233218CNA000001
- OSTI ID:
- 1493527
- Report Number(s):
- LA-UR--19-20885
- Country of Publication:
- United States
- Language:
- English
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