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Canadian Forces Uranium Testing Program
Published in Alexandra C. Miller, Depleted Uranium, 2006
The advantages of TIMS are the low detection limit (0.1 picogram for both 235U and 238U) and the precision in the isotopic ratios (0.05–0.2%). At their best, ICP front ends deliver approximately 10% of a sample into the mass spectrometer, whereas approximately 100% of a sample will be thermally ionized in a TIMS. As a result, TIMS is approximately 10 times more sensitive than any ICP-MS. The high precision for isotopic ratios is due to the simultaneous measurement of the ion intensity from the two isotopes of interest, which negates any instrument instability. The only ICP-MS instrument with comparable precision is a sector field instrument equipped with a multicollector array.
Behaviors of actinides in chromatographic separation by using TBP resin in nitric acid solution and hydrochloric acid solution
Published in Journal of Nuclear Science and Technology, 2023
Fauzia Hanum Ikhwan, Hiroyuki Kazama, Chikage Abe, Kenji Konashi, Tatsuya Suzuki
Precise and accurate isotope ratio measurements of radionuclides are necessary for various applications, e.g. for analysis of nuclear samples, radioactive waste, and environmental materials, such as biological samples, soils, dust, and water, especially for geological and medical samples. For isotope analysis of metals and metalloids, thermal ionization mass spectrometry (TIMS) has been mainly used in the domain of geochemistry and cosmochemistry. The introduction of inductively coupled plasma mass spectrometry (ICP-MS) had a huge impact on the field of isotopic analysis. The application of ICP-MS in elemental analysis and isotope analysis of actinides have been massively studied for natural thorium isotopes level in marine [1], plutonium isotopic composition [2] actinides determination in urine [3] isotope analyses in clinical samples [4], and radioactive waste characterization in nuclear application [5,6]. Recently in Japan, ICP-MS is used to detect nuclides and analyse isotope ratio of sample from debris for characterization for decommissioning of Fukushima-Daiichi Nuclear Power Plant [7].
Case study: Using all the available data to assess a measurement system via a Bayesian analysis of unbalanced data
Published in Quality Engineering, 2023
M. S. Hamada, A. C. Olson, L. Tandon
This article considers the use of a hierarchical model to incorporate all the data availabe for assessing a new measurement system that measures isotopic weight percent. The measurement is the isotopic weight percent of a Pu isotope in a sample of a single Pu metal standard. The isotopic weight percent is measured by thermal ionization mass spectroscopy or TIMS. The standard is used in a sample exchange program which is also known as a round robin or interlaboratory study. The standard has a consensus value as determined by a previously conducted sample exchange program of 0.0128 weight percent.