3 MV accelerator mass spectrometry measurements of 36Cl using the Isobar Separator for Anions
Bibliographic record
Abstract
A second low-energy injection line containing the Isobar Separator for Anions (ISA), a radiofrequency quadrupole reaction cell system, was installed on the 3 MV tandem accelerator system at the A. E. Lalonde (AEL) accelerator mass spectrometry (AMS) Laboratory. The suppression of 36 S via anion-gas reaction with NO 2 was evaluated for measurements of 36 Cl reference materials and a dilution series, using a 3 MV AMS system. The dilution series, with 36 Cl/Cl ratios ranging from 10 -11 to 10 -15 , were measured in comparison with external measurement. 36 Cl/Cl blank levels of (7 ± 4) x10 -15 were reached. While ISA-AMS is not currently able to achieve sufficient separation for most 36 Cl applications, these measurements show progress towards routine measurement of 36 Cl and demonstrate the steps required to validate such measurements on lower energy AMS systems. • 3 MV AMS and a radiofrequency quadrupole reaction cell were used to measure 36 Cl. • The isobar 36 S - was suppressed by 7 orders of magnitude using reactions with NO 2 . • Dilutions series with 36 Cl/Cl ratios ranging from 10 -11 to 10 -15 and a blank level of 7 x10 -15 were measured. • Progress has been made towards using the Isobar Separator for Anions to the routine measurement of 36 Cl on lower energy AMS systems.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".