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

Abstract

The CR-39 nuclear track detector is used in many nuclear diagnostics fielded at inertial confinement fusion (ICF) facilities. Large x-ray uences 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 α and K 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.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1170585
Grant/Contract Number:
NA0001857; NA0002035
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 86; Journal Issue: 3; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Rojas-Herrera, J., Rinderknecht, H. G., Zylstra, A. B., Gatu Johnson, M., Orozco, D., Rosenberg, M. J., Sio, H., Seguin, F. H., Frenje, J. A., Li, C. K., and Petrasso, R. D. Impact of x-ray dose on the response of CR-39 to 1–5.5 MeV alphas. United States: N. p., 2015. Web. doi:10.1063/1.4913906.
Rojas-Herrera, J., Rinderknecht, H. G., Zylstra, A. B., Gatu Johnson, M., Orozco, D., Rosenberg, M. J., Sio, H., Seguin, F. H., Frenje, J. A., Li, C. K., & Petrasso, R. D. Impact of x-ray dose on the response of CR-39 to 1–5.5 MeV alphas. United States. doi:10.1063/1.4913906.
Rojas-Herrera, J., Rinderknecht, H. G., Zylstra, A. B., Gatu Johnson, M., Orozco, D., Rosenberg, M. J., Sio, H., Seguin, F. H., Frenje, J. A., Li, C. K., and Petrasso, R. D. Sun . "Impact of x-ray dose on the response of CR-39 to 1–5.5 MeV alphas". United States. doi:10.1063/1.4913906. https://www.osti.gov/servlets/purl/1170585.
@article{osti_1170585,
title = {Impact of x-ray dose on the response of CR-39 to 1–5.5 MeV alphas},
author = {Rojas-Herrera, J. and Rinderknecht, H. G. and Zylstra, A. B. and Gatu Johnson, M. and Orozco, D. and Rosenberg, M. J. and Sio, H. and Seguin, F. H. and Frenje, J. A. and Li, C. K. and Petrasso, R. D.},
abstractNote = {The CR-39 nuclear track detector is used in many nuclear diagnostics fielded at inertial confinement fusion (ICF) facilities. Large x-ray uences 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-Kα and Kβ 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.},
doi = {10.1063/1.4913906},
journal = {Review of Scientific Instruments},
number = 3,
volume = 86,
place = {United States},
year = {Sun Mar 01 00:00:00 EST 2015},
month = {Sun Mar 01 00:00:00 EST 2015}
}

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