Impact of x-ray dose on the response of CR-39 to 1–5.5 MeV alphas
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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.
Date Issued
March 2015
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
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Plasma Science and Fusion Center
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DOI of Published Version
https://doi.org/10.1063/1.4913906
