Bibliographic record
Abstract
Radon, one of the pollution sources of indoor air, is colorless, odorless, and tasteless noble gas, and is easily inhaled by humans, causing them lung cancer. The purpose of this study is to examine an amount of radon emission from gypsum boards among indoor building materials, and analyze indoor radon concentration through ventilation, which is another control method. Although it is known that 80-90% of radon flows into indoors through soil, it was also identified at high-rise apartment floors. This is judged to be resulted by building materials, and among them, gypsum board is being pointed out as the main cause. The standard of radon concentration is 148Bq/㎥ in America and Korea and 200Bq/㎥ in Canada, and Sweden is applying stricter standard to new houses (200Bq/㎥) than existing houses (400Bq/㎥). There are five gypsum board plants in Korea, Daejuk, Yeochoen, Daesan, Yeosu, and Ulsan, and gypsum boards that had been produced by each plant since 2014 were collected and then an amount of radon emission of one week was examined. As a result, max. 20Bq/㎥ was recorded, which is lower than the average indoor radon concentration, 48Bq/㎥. In addition, because an amount of radon emission from gypsum board produced in 2010 was confirmed to be 215Bq/㎥, it seems that phospho-gypsum board was converted to desulfurized gypsum board only lately, being applied by QC (Quality Control). Thus, it is needed to find out ways to control radon, ventilation or remodeling, for existing buildings, although gypsum boards of recently constructed buildings could be free from radon. For a basic way to control indoor radon spreading, ventilation should be done. For the experiment, gypsum board that produces a large amount of radon was put in a self-produced acrylic vessel, and ventilation was applied by blowing wind to it using a DC fan, and the change of an amount of radon contained in the vessel was observed. When the amount of radon 168Bq/㎥ was constantly applied by ventilation (once, wind speed 0.12m/s), it was reduced down to 16Bq/㎥ 4 days later, and when the amount of radon 303Bq/㎥ was constantly applied by ventilation (three times, wind speed 0.36m/s), it was reduced down to 30Bq/㎥ 4 days later. It is judged to be a satisfactory level because it is between 15Bq/㎥, outdoor average radon concentration, and 48Bq/㎥, indoor average radon concentration.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.007 | 0.003 |
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".