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- W4310857060 abstract "New data are reported for polyvinylidene fluoride (PVDF), polyphenylene sulfide (PPS), and two forms of polyetherimide (PEI, branded ULTEM 1010 and 9085). Data for starting filaments and both simple and complex printed parts are reported. PVDF filaments and simple printed beads, were found to have values of approximately 30 and 50 ppt for Th-232 and U-238, respectively, while a more complex spring clip part had slightly elevated Th-232 levels of 65 ppt, with U-238 remaining at 50 ppt. PPS filament was found to have concentrations of 270 and 710 ppt for Th-232 and U-238, respectively, and were not chosen to be printed as those levels were already higher than other material options. ULTEM 1010 filaments and printed complex spring clip parts were found to have concentrations of around 5 and 7 ppt for Th-232 and U-238, respectively, illustrating no significant contamination from the printing process. ULTEM 9085 filaments were found to have concentrations of around 9 and 5 ppt for Th-232 and U-238, respectively, while the printed complex spring clip part was found to have slightly elevated concentrations of 25 and 7 ppt for Th-232 and U-238, respectively. These results were all obtained using a novel dry ashing method in crucibles constructed of ultralow background electroformed copper or, when applicable, microwave-assisted wet ashing digestion. Samples and process blanks were spiked with Th-229 and U-233 as internal standards prior to dry/wet ashing and determinations were made by inductively coupled plasma mass spectrometry (ICP-MS). In order to maintain high radiopurity levels, pre-cleaning the filaments before printing and post-cleaning the parts is recommended, although the printing process itself has shown to contribute very minute amounts of radiocontaminants." @default.
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- W4310857060 date "2023-02-01" @default.
- W4310857060 modified "2023-09-27" @default.
- W4310857060 title "Mass spectrometric investigations into 3D printed parts to assess radiopurity as ultralow background materials for rare event physics detectors" @default.
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- W4310857060 doi "https://doi.org/10.1016/j.nima.2022.167830" @default.
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