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Title: Ultra-low radioactivity Kapton and copper-Kapton laminates

Abstract

Polyimide-based materials, like Kapton, are widely used in flexible cables and circuitry due to their unique electrical and mechanical characteristics. This study is aimed at investigating the radiopurity of Kapton for use in ultralow background, rare-event physics applications by measuring the 238U, 232Th, and natK levels using inductively coupled plasma mass spectrometry. Commercial-off-the-shelf Kapton varieties, mea- sured at approximately 950 and 120 pg/g 238U and 232Th (1.2×104 and 490 µBq/kg), respectively, can be a significant background source for many current and next-generation ultralow background detectors. This study has found that the dominant contamination is due to the use of dicalcium phosphate (DCP), a nonessential slip additive added during manufacturing. Alternative Kapton materials were obtained that did not contain DCP and were determined to be significantly more radiopure than the commercially- available options with 12 and 19 pg/g 238U and 232Th (150 and 77 µBq/kg), respectively. The lowest radioactivity version produced (Kapton ELJ, which contains an adhesive) was found to contain single digit pg/g levels of 238U and 232Th, two-to-three orders of magnitude cleaner than commercial-off-the- shelf options. Moreover, copper-clad polyimide laminates employing Kapton ELJ as the insulator were obtained and measured and showed to be very radiopure at 8.6 andmore » 22 pg/g 238U and 232Th (110 and 89 µBq/kg), respectively.« less

Authors:
 [1];  [1];  [1];  [1]; ORCiD logo [1]
  1. BATTELLE (PACIFIC NW LAB)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1600024
Report Number(s):
PNNL-SA-148130
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 959
Country of Publication:
United States
Language:
English

Citation Formats

Arnquist, Isaac J., Beck, Chelsie L., di Vacri, Maria Laura, Harouaka, Khadouja, and Saldanha, Richard N. Ultra-low radioactivity Kapton and copper-Kapton laminates. United States: N. p., 2020. Web. doi:10.1016/j.nima.2020.163573.
Arnquist, Isaac J., Beck, Chelsie L., di Vacri, Maria Laura, Harouaka, Khadouja, & Saldanha, Richard N. Ultra-low radioactivity Kapton and copper-Kapton laminates. United States. doi:10.1016/j.nima.2020.163573.
Arnquist, Isaac J., Beck, Chelsie L., di Vacri, Maria Laura, Harouaka, Khadouja, and Saldanha, Richard N. Sat . "Ultra-low radioactivity Kapton and copper-Kapton laminates". United States. doi:10.1016/j.nima.2020.163573.
@article{osti_1600024,
title = {Ultra-low radioactivity Kapton and copper-Kapton laminates},
author = {Arnquist, Isaac J. and Beck, Chelsie L. and di Vacri, Maria Laura and Harouaka, Khadouja and Saldanha, Richard N.},
abstractNote = {Polyimide-based materials, like Kapton, are widely used in flexible cables and circuitry due to their unique electrical and mechanical characteristics. This study is aimed at investigating the radiopurity of Kapton for use in ultralow background, rare-event physics applications by measuring the 238U, 232Th, and natK levels using inductively coupled plasma mass spectrometry. Commercial-off-the-shelf Kapton varieties, mea- sured at approximately 950 and 120 pg/g 238U and 232Th (1.2×104 and 490 µBq/kg), respectively, can be a significant background source for many current and next-generation ultralow background detectors. This study has found that the dominant contamination is due to the use of dicalcium phosphate (DCP), a nonessential slip additive added during manufacturing. Alternative Kapton materials were obtained that did not contain DCP and were determined to be significantly more radiopure than the commercially- available options with 12 and 19 pg/g 238U and 232Th (150 and 77 µBq/kg), respectively. The lowest radioactivity version produced (Kapton ELJ, which contains an adhesive) was found to contain single digit pg/g levels of 238U and 232Th, two-to-three orders of magnitude cleaner than commercial-off-the- shelf options. Moreover, copper-clad polyimide laminates employing Kapton ELJ as the insulator were obtained and measured and showed to be very radiopure at 8.6 and 22 pg/g 238U and 232Th (110 and 89 µBq/kg), respectively.},
doi = {10.1016/j.nima.2020.163573},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = ,
volume = 959,
place = {United States},
year = {2020},
month = {4}
}