Experimental Comparison of 2-3MV X-Ray Sources for Flash Radiography

MENGE, PETER RICHARD ; JOHNSON, DAVID LEE ; MAENCHEN, JOHN E. ; OLSON, CRAIG L. ; ROVANG, DEAN C. ; DROEMER, D. ; HUNT, E. ; OLIVER, BRYAN VELTEN ; ROSE, DAVID VINCENT ; WELCH, DALE ROBERT

Sandia National Laboratories

关键词: 46 Instrumentation Related To Nuclear Science And Technology;    Cathodes;    X-Ray Radiography;    Semiconductor Diodes;    43 Particle Accelerators;   

DOI  :  10.2172/792878
RP-ID  :  SAND2002-0082
RP-ID  :  AC04-94AL85000
RP-ID  :  792878

美国|英语

来源: UNT Digital Library

【 摘 要 】

High-brightness flash x-ray sources are needed for penetrating dynamic radiography for a variety of applications. Various bremsstrahlung source experiments have been conducted on the TriMeV accelerator (3MV, 60 {Omega}, 20 ns) to determine the best diode and focusing configuration in the 2-3 MV range. Three classes of candidate diodes were examined: gas cell focusing, magnetically immersed, and rod pinch. The best result for the gas cell diode was 6 rad at 1 meter from the source with a 5 mm diameter x-ray spot. Using a 0.5 mm diameter cathode immersed in a 17 T solenoidal magnetic field, the best shot produced 4.1 rad with a 2.9 mm spot. The rod pinch diode demonstrated very reproducible radiographic spots between 0.75 and 0.8 mm in diameter, producing 1.2 rad. This represents a factor of eight improvement in the TriMeV flash radiographic capability above the original gas cell diode to a figure of merit (dose/spot diameter) > 1.8 rad/mm. These results clearly show the rod pinch diode to be the choice x-ray source for flash radiography at 2-3 M V endpoint.