Scintillation characteristics of 90%Lu LGSO with different decay times
Bibliographic record
Abstract
High lutetium content LGSO [Lu <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1.8</sub> Gd <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.2</sub> SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">5</sub> :Ce] with decay time constants in the range 30-45 ns were introduced by Hitachi Chemical Ltd. (Japan) around 2006. At first an experimental development, mass production has now been established and mature 90%Lu LGSO scintillators with stable characteristics have become available. The aim of this work was to assess the scintillation characteristics of the current production of 90%Lu LGSO with different decay times using avalanche photodiode (APD) readout. Samples from the most recent production of Fast (~30 ns), Standard (~40 ns) and Slow (~47 ns) 90%Lu LGSO (manufactured in 2013), extracted from top, middle and bottom positions into the ingots, have been studied. The decay time and central emission wavelength results demonstrate good agreement for samples of the same ingot, irrespective of the position where the sample was obtained. The photoelectron yields of the most recent Slow, Standard and Fast LGSO scintillators show good uniformity. Their average photoelectron yields are respectively 34 000 ± 1 000 phe/MeV, 31 200 ± 500 phe/MeV and 28 000 ± 2 000 phe/MeV without any definite trend or bias with respect to position in ingots. The average energy resolution of Slow is 10 ± 2% whereas Standard and Fast LGSO samples have identical energy resolution of 11 ± 3%. The light yield non-proportionality as a function of irradiation energy was investigated. At 60 keV, the departure from linearity is 16 ± 4% for Slow and Standard LGSO and 15 ± 1% for Fast LGSO.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| 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 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 teacher head, 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".