Actinide measurements by AMS using fluoride matrices

Developing Accelerator Mass Spectrometry Capabilities for Anthropogenic Radionuclide Analysis to Extend the Set of Oceanographic Tracers

“…The AMS methodological development at VERA for actinide detection recently focused on the possibility to increase the negative ionization yield of U by adding the fluorine donator PbF 2 to the sample matrix for the cesium sputter source. Fluoride compounds of U (e.g., UF 5 − ) are then extracted from the ion source instead of the previously used oxide compounds (e.g., UO − ) (Zhao et al, 2010;Cornett et al, 2015;Kazi et al, 2015). While, e.g., Hotchkis et al (2019) report similarly high ionization efficiencies for UO − of several percent from their ion source, this is not observed by a number of other AMS laboratories including VERA.…”

A preliminary study of rapid measurements of aqueous 210Po by accelerator mass spectrometry

“…, 239,240 Pu, 241 Am, 226 Ra, etc. ) measurements using accelerator mass spectrometry (AMS), 28–30 we aimed to develop a similar new procedure for the rapid assessment of 210 Po in water by AMS. In these established methods, the aqueous radioisotopes are efficiently extracted and measured through a co-precipitation agent.…”

“…In these established methods, the aqueous radioisotopes are efficiently extracted and measured through a co-precipitation agent. 28–30 Thus, the AMS sample processing is expected to be less time consuming compared to alpha spectrometry. In addition, with the capacity of analyzing batches of 50 to 200 samples together, the automated AMS system exhibits its potential as a rapid analytical method.…”

Comparison of the measurement of Pu and Am isotopes by AMS using fluoride and oxide anion beams

“…femto gram level) in environmental and bioassay samples has been achieved by combining thorough sample clean-up techniques and sensitive analytical methods. [4][5][6] Accelerator Mass Spectrometry (AMS) is one of the most sensitive methods for radioisotopes including actinide measurement. It has attracted considerable attention in recent years due to its high sensitivity as well as high throughput.…”

“…15 The present authors have utilized the uoride precipitation technique using Nd, and used PbF 2 powder to mix with the NdF 3 precipitate. 5,6,16 239,240 Pu and 241 Am oxide anion (MO n À ) beams are produced from a Cs + sputter ion source using the oxide samples. Similarly, 239,240 Pu and 241 Am uoride anion (MF n À ) beams are produced when the uoride targets are placed in the Cs + sputter ion source.…”