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- Ho, Doris M.L., et al.
(författare)
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Overall approaches and experiences of first-time participants in the Nuclear Forensics International Technical Working Group’s Fourth Collaborative Material Exercise (CMX-4)
- 2018
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Ingår i: Journal of Radioanalytical and Nuclear Chemistry. - : Springer Science and Business Media LLC. - 0236-5731 .- 1588-2780. ; 315:2, s. 353-363
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Tidskriftsartikel (refereegranskat)abstract
- The Fourth Collaborative Material Exercise (CMX-4) of the Nuclear Forensics International Technical Working Group (ITWG) registered the largest participation for this exercise in nuclear forensics, with seven of the 17 laboratories participating for the first time. Each of the laboratories had their strategic role to play in its respective country, analyzing real-world samples using their in-house resources. The scenario was fictitious but was thoughtfully crafted to engage participants in nuclear forensic investigations. In this paper, participants from five of the first-time laboratories shared their individual experience in this exercise, from preparation to analysis of samples.
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- Malmberg, Per, 1974, et al.
(författare)
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Depth profiling of cells and tissues by using C-60(+) and SF5+ as sputter ions
- 2007
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Ingår i: APPLIED SURFACE SCIENCE. - : Elsevier BV. - 0169-4332. ; 255:4, s. 926-928
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Tidskriftsartikel (refereegranskat)abstract
- In the present study, SF5+ and C-60(+) were used as primary ions for sputtering and Bi-3(+) was used as primary ions for analysis. The depth profiling procedure was utilized to make 3D images of the chemistry of single cultured cells and tissue samples of intact intestinal epithelium. The results show sputtering of organic material from cells and tissue with both SF5+ and C-60(+) sources. Cholesterol fragments were found in the superficial layers when sputtering with C-60(+). Spectra were collected revealing the change in yield along the z-axis of the sample. 3D images of the localization of Na, K, phosphocholine and cholesterol were constructed with both ion sources for single cell cultures and the mouse intestine. Cryostate sections of mouse intestine were analysed in 2D and the results were compared with the 3D image of the intestine. The localization of cholesterol and phosphocholine was found to be similar in cryostate sections analysed in two dimensions and the sputtered, freeze-dried intestine analysed in 3D. The comparison of 2D and 3D images suggest that the phosphocholine signal faded with C-60(+) sputtering. In conclusion, both C-60(+) and SF5+ can be used as primary ion sources for sputtering of organic material from cells and tissues. Consecutive analysis with a Bi-3(+) source can be used to obtain image stacks that could be used for reconstruction of 3D images. (C) 2008 Elsevier B. V. All rights reserved.
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- Ramebäck, Henrik, 1967, et al.
(författare)
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On the accuracy of gamma spectrometric isotope ratio measurements of uranium
- 2016
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Ingår i: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. - : Elsevier BV. - 0168-9002. ; 815, s. 57-61
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Tidskriftsartikel (refereegranskat)abstract
- The isotopic composition of uranium was measured using high resolution gamma spectrometry. Two acid solutions and two samples in the form of UO2 pellets were measured. The measurements were done in close geometries, i.e. directly on the endcap of the high purity germanium detector (HPGe). Applying no corrections for count losses due to true coincidence summing (TCS) resulted in up to about 40% deviation in the abundance of U-235 from the results obtained with mass spectrometry. However, after correction for TCS, excellent agreement was achieved between the results obtained using two different measurement methods, or a certified value. Moreover, after corrections, the fitted relative response curves correlated excellently with simulated responses, for the different geometries, of the HPGe detector.
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