Nuclear forensic science: correlating measurable material parameters to the history of nuclear material.

https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2017GC007050

A New Chronology of Late Quaternary Sequences From the Central Arctic Ocean Based on “Extinction Ages” of Their Excesses in 231Pa and 230Th

/pdf/process-attribute-monitoring-approach-to-gaseous-centrifuge-5te8gjrvvc.pdf

Process Attribute Monitoring Approach to Gaseous Centrifuge Enrichment Plant Safeguards

Techniques have been developed which permit rapid, high-precision analyses of uranium and plutonium by multiple-filament thermal ionization mass spectrometry utilizing a commercial multicollector instrument. The salient feature of the method is volatilization of the entire sample while simultaneously integrating the signal from each isotope, thus virtually eliminating the effects of isotope fractionation in the evaporation process. The method permits the analysis of samples much smaller than required for conventional techniques using Faraday collectors and is expected to have application in the analysis of many elements in addition to uranium and plutonium. Run-to-run reproducibilities of <0.02% (RSD) have been obtained for isotope ratios of uranium and plutonium. 7 refs., 5 figs., 4 tabs.

/pdf/high-precision-isotopic-analyses-of-uranium-and-plutonium-by-54grwegj9k.pdf

High precision isotopic analyses of uranium and plutonium by total sample volatilization and signal integration

For the first time, using ICP-MS/MS, the 234U, 235U, 236U, and 238U in the sediment samples from coastal region, Bangladesh, were measured as 5.13–5.48, 0.234–0.252, (2.70–4.59) × 10–5, and 4.92–5.31 Bq kg−1, and the 236U/238U atom ratios were (2.87–4.57) × 10–8, indicating the predominate influence of global fallout on 236U. For the rock samples from hilly area, the corresponding concentrations were much higher as 18.7–4023, 0.902–173, 9.58 × 10–5–1.29 × 10–2, and 18.8–2279 Bq kg−1, but the 236U/238U atom ratios were in the same range of (1.52–3.04) × 10–8, indicating the 236U was primarily due to the natural nuclear reactions.

First study on 236U in environmental samples from Bangladesh by ICP-MS/MS prior to the operation of its first nuclear power plant

We apologize for the incompleteness of the abstract. Citation downloaded from http://cdsweb. cern. ch/search. py?recid=452744&ln=en on 20041019

Ovaskainen Rm

Papers

The Determination of minor isotope abundances in naturally occurring uranium materials