Intense nanosecond duration source of 10-250 keV x rays suitable for imaging projectile-induced cavitation in human cadaver tissue

Journal Article · Tue Mar 01 04:00:00 EST 2005 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.1864792· OSTI ID:20644139

Boyer, Craig N; Holland, Glenn E; Seely, John F ^[1]

---

1. Praxis Inc., 2200 Mill Road, Alexandria, Virginia 22314 (United States)

The design, fabrication, and performance of a repetitive nanosecond x-ray source having a pumped field-emission x-ray tube are described. A compact Marx generator, 61 cm in length and storing 12 J energy, directly drives the field-emission tube with voltage pulses >380 kV and with <4 ns rise time from an equivalent generator impedance of 52 {omega}. The x-ray dose is 520 {mu}Sv at a distance of 30.5 cm. A numerical simulation model is used in which the x-ray tube's cathode width and anode-cathode gap spacing are permitted to change with time, while electron flow between the cathode and anode is space charge limited and nonrelativistic. The x-ray tube model is coupled to an equivalent circuit representation of the Marx generator that includes the capacitance variation with charging voltage of the BaTiO{sub 3} capacitors. The capabilities of the x-ray source for flash radiography have been demonstrated by the study of the evolution of cavitation in human cadaver legs induced by high-velocity projectiles.

• OSTI ID: 20644139
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 3 Vol. 76; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

60 APPLIED LIFE SCIENCES
ANODES
CAPACITANCE
CATHODES
ELECTRIC POTENTIAL
EQUIVALENT CIRCUITS
FIELD EMISSION
IMAGE PROCESSING
KEV RANGE 10-100
KEV RANGE 100-1000
MARX GENERATORS
OMEGA BARYONS
ORGANS
PULSE RISE TIME
SPACE CHARGE
TITANATES
X-RAY SOURCES
X-RAY TUBES