{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,9]],"date-time":"2026-02-09T11:26:07Z","timestamp":1770636367877,"version":"3.49.0"},"reference-count":75,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2023,1,30]],"date-time":"2023-01-30T00:00:00Z","timestamp":1675036800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Entropy"],"abstract":"<jats:p>The development of reinforced polymer composite materials has had a significant influence on the challenging problem of shielding against high-energy photons, particularly X-rays and \u03b3-rays in industrial and healthcare facilities. Heavy materials\u2019 shielding characteristics hold a lot of potential for bolstering concrete chunks. The mass attenuation coefficient is the main physical factor that is utilized to measure the narrow beam \u03b3-ray attenuation of various combinations of magnetite and mineral powders with concrete. Data-driven machine learning approaches can be investigated to assess the gamma-ray shielding behavior of composites as an alternative to theoretical calculations, which are often time- and resource-intensive during workbench testing. We developed a dataset using magnetite and seventeen mineral powder combinations at different densities and water\/cement ratios, exposed to photon energy ranging from 1 to 1006 kiloelectronvolt (KeV). The National Institute of Standards and Technology (NIST) photon cross-section database and software methodology (XCOM) was used to compute the concrete\u2019s \u03b3-ray shielding characteristics (LAC). The XCOM-calculated LACs and seventeen mineral powders were exploited using a range of machine learning (ML) regressors. The goal was to investigate whether the available dataset and XCOM-simulated LAC can be replicated using ML techniques in a data-driven approach. The minimum absolute error (MAE), root mean square error (RMSE), and R2score were employed to assess the performance of our proposed ML models, specifically a support vector machine (SVM), 1d-convolutional neural network (CNN), multi-Layer perceptrons (MLP), linear regressor, decision tree, hierarchical extreme machine learning (HELM), extreme learning machine (ELM), and random forest networks. Comparative results showed that our proposed HELM architecture outperformed state-of-the-art SVM, decision tree, polynomial regressor, random forest, MLP, CNN, and conventional ELM models. Stepwise regression and correlation analysis were further used to evaluate the forecasting capability of ML techniques compared to the benchmark XCOM approach. According to the statistical analysis, the HELM model showed strong consistency between XCOM and predicted LAC values. Additionally, the HELM model performed better in terms of accuracy than the other models used in this study, yielding the highest R2score and the lowest MAE and RMSE.<\/jats:p>","DOI":"10.3390\/e25020253","type":"journal-article","created":{"date-parts":[[2023,1,30]],"date-time":"2023-01-30T10:19:28Z","timestamp":1675073968000},"page":"253","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["A Novel Hierarchical Extreme Machine-Learning-Based Approach for Linear Attenuation Coefficient Forecasting"],"prefix":"10.3390","volume":"25","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3616-6032","authenticated-orcid":false,"given":"Giuseppe","family":"Varone","sequence":"first","affiliation":[{"name":"Department of Neuroscience and Imaging, University of Chieti Pescara, 66100 Chieti, Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7890-2897","authenticated-orcid":false,"given":"Cosimo","family":"Ieracitano","sequence":"additional","affiliation":[{"name":"DICEAM, University Mediterranea of Reggio Calabria, Via Graziella, Feo di Vito, 89060 Reggio Calabria, Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4424-7622","authenticated-orcid":false,"given":"Aybike \u00d6zy\u00fcksel","family":"\u00c7ift\u00e7io\u011flu","sequence":"additional","affiliation":[{"name":"Department of Civil Engineering, Manisa Celal Bayar University, 45140 Manisa, Turkey"}]},{"given":"Tassadaq","family":"Hussain","sequence":"additional","affiliation":[{"name":"School of Computing, Merchiston Campus, Edinburgh Napier University, Edinburgh EH10 5DT, UK"}]},{"given":"Mandar","family":"Gogate","sequence":"additional","affiliation":[{"name":"School of Computing, Merchiston Campus, Edinburgh Napier University, Edinburgh EH10 5DT, UK"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9651-6487","authenticated-orcid":false,"given":"Kia","family":"Dashtipour","sequence":"additional","affiliation":[{"name":"School of Computing, Merchiston Campus, Edinburgh Napier University, Edinburgh EH10 5DT, UK"}]},{"given":"Bassam Naji","family":"Al-Tamimi","sequence":"additional","affiliation":[{"name":"School of Computing and Digital Technology, Birmingham City University, Birmingham B4 7XG, UK"}]},{"given":"Hani","family":"Almoamari","sequence":"additional","affiliation":[{"name":"Faculty of Computer and Information Systems, Islamic University of Madinah, Medina 42351, Saudi Arabia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5247-7850","authenticated-orcid":false,"given":"Iskender","family":"Akkurt","sequence":"additional","affiliation":[{"name":"Physics Department, Suleyman Demirel University, 32260 Isparta, Turkey"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8080-082X","authenticated-orcid":false,"given":"Amir","family":"Hussain","sequence":"additional","affiliation":[{"name":"School of Computing, Merchiston Campus, Edinburgh Napier University, Edinburgh EH10 5DT, UK"}]}],"member":"1968","published-online":{"date-parts":[[2023,1,30]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"840","DOI":"10.1038\/nphoton.2010.267","article-title":"Nanoscale X-ray imaging","volume":"4","author":"Sakdinawat","year":"2010","journal-title":"Nat. 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