Toward the Threshold of Radiation Hazards of U in Chinese Coal through the CART Algorithm
The high volume of coal used for combustion usually leads to a large amount of coal combustion residues (CCRs), which contain the naturally occurring radioactive materials (NORMs) decayed from U and Th in coals. The high radioactivity of NORMs can cause potential harm to humans if the CCRs are used as building materials. The activities of CCRs not only depend on the concentrations of radionuclides but also largely depend on the variations of ash yields of coal. On the other hand, ash yields significantly vary in coal from less than 1-50%. This indicates that similar concentrations of radionuclides in coal with different ash yields generally do not result in similar activities in CCRs. Therefore, it is significant to build a threshold of U in coals with different ash yield levels. In this research, based on the data of 945 coal samples from China and the selected optimal model using the classification and regression tree algorithm, the threshold of U for the radiation hazard is determined to be 7.98 mg/kg for coals with ash yields higher than 20%, while the threshold of U for the radiation hazard is 5.28 mg/kg for coals with ash yields lower than 20%.
| Medienart: |
E-Artikel |
|---|
| Erscheinungsjahr: |
2022 |
|---|---|
| Erschienen: |
2022 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:56 |
|---|---|
| Enthalten in: |
Environmental science & technology - 56(2022), 3 vom: 01. Feb., Seite 1864-1874 |
| Sprache: |
Englisch |
|---|
| Beteiligte Personen: |
Xu, Na [VerfasserIn] |
|---|
| Links: |
|---|
| Anmerkungen: |
Date Completed 11.04.2022 Date Revised 11.04.2022 published: Print-Electronic Citation Status MEDLINE |
|---|
| doi: |
10.1021/acs.est.1c07776 |
|---|
| funding: |
|
|---|---|
| Förderinstitution / Projekttitel: |
|
| PPN (Katalog-ID): |
NLM335839479 |
|---|
| LEADER | 01000naa a22002652 4500 | ||
|---|---|---|---|
| 001 | NLM335839479 | ||
| 003 | DE-627 | ||
| 005 | 20231225230755.0 | ||
| 007 | cr uuu---uuuuu | ||
| 008 | 231225s2022 xx |||||o 00| ||eng c | ||
| 024 | 7 | |a 10.1021/acs.est.1c07776 |2 doi | |
| 028 | 5 | 2 | |a pubmed24n1119.xml |
| 035 | |a (DE-627)NLM335839479 | ||
| 035 | |a (NLM)35049288 | ||
| 040 | |a DE-627 |b ger |c DE-627 |e rakwb | ||
| 041 | |a eng | ||
| 100 | 1 | |a Xu, Na |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Toward the Threshold of Radiation Hazards of U in Chinese Coal through the CART Algorithm |
| 264 | 1 | |c 2022 | |
| 336 | |a Text |b txt |2 rdacontent | ||
| 337 | |a ƒaComputermedien |b c |2 rdamedia | ||
| 338 | |a ƒa Online-Ressource |b cr |2 rdacarrier | ||
| 500 | |a Date Completed 11.04.2022 | ||
| 500 | |a Date Revised 11.04.2022 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a The high volume of coal used for combustion usually leads to a large amount of coal combustion residues (CCRs), which contain the naturally occurring radioactive materials (NORMs) decayed from U and Th in coals. The high radioactivity of NORMs can cause potential harm to humans if the CCRs are used as building materials. The activities of CCRs not only depend on the concentrations of radionuclides but also largely depend on the variations of ash yields of coal. On the other hand, ash yields significantly vary in coal from less than 1-50%. This indicates that similar concentrations of radionuclides in coal with different ash yields generally do not result in similar activities in CCRs. Therefore, it is significant to build a threshold of U in coals with different ash yield levels. In this research, based on the data of 945 coal samples from China and the selected optimal model using the classification and regression tree algorithm, the threshold of U for the radiation hazard is determined to be 7.98 mg/kg for coals with ash yields higher than 20%, while the threshold of U for the radiation hazard is 5.28 mg/kg for coals with ash yields lower than 20% | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Research Support, Non-U.S. Gov't | |
| 650 | 4 | |a building materials | |
| 650 | 4 | |a classification and regression tree | |
| 650 | 4 | |a coal combustion residues | |
| 650 | 4 | |a naturally occurring radioactive materials | |
| 650 | 4 | |a radiation hazard | |
| 650 | 7 | |a Coal |2 NLM | |
| 650 | 7 | |a Coal Ash |2 NLM | |
| 700 | 1 | |a Yang, Yuchen |e verfasserin |4 aut | |
| 700 | 1 | |a Peng, Mengmeng |e verfasserin |4 aut | |
| 700 | 1 | |a Li, Qing |e verfasserin |4 aut | |
| 700 | 1 | |a Xu, Chuanpeng |e verfasserin |4 aut | |
| 700 | 1 | |a Dai, Shifeng |e verfasserin |4 aut | |
| 773 | 0 | 8 | |i Enthalten in |t Environmental science & technology |d 1967 |g 56(2022), 3 vom: 01. Feb., Seite 1864-1874 |w (DE-627)NLM112374735 |x 1520-5851 |7 nnns |
| 773 | 1 | 8 | |g volume:56 |g year:2022 |g number:3 |g day:01 |g month:02 |g pages:1864-1874 |
| 856 | 4 | 0 | |u http://dx.doi.org/10.1021/acs.est.1c07776 |3 Volltext |
| 912 | |a GBV_USEFLAG_A | ||
| 912 | |a GBV_NLM | ||
| 951 | |a AR | ||
| 952 | |d 56 |j 2022 |e 3 |b 01 |c 02 |h 1864-1874 | ||