Studies of an improved system for the radial implantation of radio-isotopes
Why this work is in the frame
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Bibliographic record
Abstract
We report on experiments undertaken to clarify the implantation process of a coaxial plasma-based ion implanter designed for the implantation of radio-isotopes into small, cylindrical metal surfaces. Mapping the distribution of the radioactive fragments on the reactor's surfaces allows us to verify several aspects that impact the implantation efficiency. First, by a careful design of the radioactive deposit support, we eliminated the generation of radioactive 'flakes', thus removing a source of possible contamination. Second, we verified that the material is ejected from the radioactive source (RS) in a cosine distribution. Third, we clearly demonstrated that the ionization mean free path of the radioactive fragments is only a few centimetres, much shorter than our original estimates based on an electron impact ionization model. From these results, we believe that the dominant ionization process is Penning ionization. The measurements undertaken in this study were only possible through the use of radioactive atoms and the associated radiographic mapping techniques that we developed. We have also studied a new configuration, with the RS situated on the reactor's axis, and where the implantation process depends explicitly on the potential barrier generated by the plasma. Using this new configuration with optimized parameters we believe an implantation efficiency of the order of 20% is achievable.
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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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 it