Red luminescence emission from potassium feldspars stimulated by infrared
Bibliographic record
Abstract
The use of the blue–UV Infrared stimulated luminescence (IRSL) from feldspars in luminescence dating has generally been unsuccessful due to age underestimation related to anomalous fading. The red emission from feldspar may however provide a non-fading alternative. A series of experiments are reported here which investigate IR stimulated (λ = 833 ± 5 nm) red luminescence emission from potassium feldspar. The aim is to demonstrate the potential of red IRSL as an alternative to the widely used UV-blue emission IRSL approaches. Five key factors are optimised to increase the dose-related red IRSL signal, and to decrease the background signal levels. These include photomultiplier tube (PMT) characteristics, detection filter combinations, laser diode intensity, measurement temperature, and substrate related effects. Preliminary measurements are described that illustrate the considerable potential of red IRSL for dating applications, including low sensitivity changes from volcanic potassium feldspars and high dose saturation of red IRSL from sedimentary and volcanic potassium feldspars.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
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".