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Impact of x-ray dose on the response of CR-39 to 1–5.5 MeV alphas

Author(s)
Rojas Herrera, Jimmy A.; Rinderknecht, Hans George; Zylstra, Alex Bennett; Gatu Johnson, Maria; Orozco, David; Rosenberg, Michael Jonathan; Sio, Hong Weng; Seguin, Fredrick Hampton; Frenje, Johan A; Li, C. K.; Petrasso, Richard D; ... Show more Show less
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Abstract
The CR-39 nuclear track detector is used in many nuclear diagnostics fielded at inertial confinement fusion (ICF) facilities. Large x-ray fluences generated by ICF experiments may impact the CR-39 response to incident charged particles. To determine the impact of x-ray exposure on the CR-39 response to alpha particles, a thick-target bremsstrahlung x-ray generator was used to expose CR-39 to various doses of 8 keV Cu-K[subscript α] and K[subscript β] x-rays. The CR-39 detectors were then exposed to 1–5.5 MeV alphas from an Am-241 source. The regions of the CR-39 exposed to x-rays showed a smaller track diameter than those not exposed to x-rays: for example, a dose of 3.0 ± 0.1 Gy causes a decrease of (19 ± 2)% in the track diameter of a 5.5 MeV alpha particle, while a dose of 60.0 ± 1.3 Gy results in a decrease of (45 ± 5)% in the track diameter. The reduced track diameters were found to be predominantly caused by a comparable reduction in the bulk etch rate of the CR-39 with x-ray dose. A residual effect depending on alpha particle energy is characterized using an empirical formula.
Date issued
2015-03
URI
http://hdl.handle.net/1721.1/111189
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Plasma Science and Fusion Center
Journal
Review of Scientific Instruments
Publisher
American Institute of Physics (AIP)
Citation
Rojas-Herrera, J. et al. “Impact of x-Ray Dose on the Response of CR-39 to 1–5.5 MeV Alphas.” Review of Scientific Instruments 86, 3 (March 2015): 033501 © 2015 AIP Publishing
Version: Author's final manuscript
ISSN
0034-6748
1089-7623

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