{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,20]],"date-time":"2026-01-20T13:12:39Z","timestamp":1768914759724,"version":"3.49.0"},"reference-count":36,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2016,3,30]],"date-time":"2016-03-30T00:00:00Z","timestamp":1459296000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJERPH"],"abstract":"<jats:p>The literature proves an evident association between indoor radon exposure and lung cancer, even at low doses. This study brings a new approach to the study of children\u2019s exposure to radon by aiming to evaluate exposure to indoor radon concentrations in nursery and primary schools from two districts in Portugal (Porto and Bragan\u00e7a), considering different influencing factors (occupation patterns, classroom floor level, year of the buildings\u2019 construction and soil composition of the building site), as well as the comparison with IAQ standard values for health protection. Fifteen nursery and primary schools in the Porto and Bragan\u00e7a districts were considered: five nursery schools for infants and twelve for pre-schoolers (seven different buildings), as well as eight primary schools. Radon measurements were performed continuously. The measured concentrations depended on the building occupation, classroom floor level and year of the buildings\u2019 construction. Although they were in general within the Portuguese legislation for IAQ, exceedances to international standards were found. These results point out the need of assessing indoor radon concentrations not only in primary schools, but also in nursery schools, never performed in Portugal before this study. It is important to extend the study to other microenvironments like homes, and in time to estimate the annual effective dose and to assess lifetime health risks.<\/jats:p>","DOI":"10.3390\/ijerph13040386","type":"journal-article","created":{"date-parts":[[2016,3,30]],"date-time":"2016-03-30T16:47:27Z","timestamp":1459356447000},"page":"386","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["Children\u2019s Exposure to Radon in Nursery and Primary Schools"],"prefix":"10.3390","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4163-0936","authenticated-orcid":false,"given":"Pedro","family":"Branco","sequence":"first","affiliation":[{"name":"LEPABE\u2014Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal"}]},{"given":"Rafael","family":"Nunes","sequence":"additional","affiliation":[{"name":"LEPABE\u2014Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal"}]},{"given":"Maria","family":"Alvim-Ferraz","sequence":"additional","affiliation":[{"name":"LEPABE\u2014Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal"}]},{"given":"Fernando","family":"Martins","sequence":"additional","affiliation":[{"name":"LEPABE\u2014Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4139-673X","authenticated-orcid":false,"given":"Sofia","family":"Sousa","sequence":"additional","affiliation":[{"name":"LEPABE\u2014Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2016,3,30]]},"reference":[{"key":"ref_1","unstructured":"WHO (2009). WHO Handbook on Indoor Radon\u2014A Public Health Perspective, World Health Organization. World Health Organization Library Cataloguing-in-Publication Data."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"196","DOI":"10.1016\/j.scitotenv.2015.04.076","article-title":"Radon survey in caves from Mallorca Island, Spain","volume":"526","author":"Dumitru","year":"2015","journal-title":"Sci. Total Environ."},{"key":"ref_3","first-page":"181","article-title":"Radon in indoor spaces: An underestimated risk factor for lung cancer in environmental medicine","volume":"107","author":"Schmid","year":"2010","journal-title":"Deutsch. Arztebl. Int."},{"key":"ref_4","unstructured":"United States Environmental Protection Agency (2003). EPA Assessment of Risks from Radon in Homes. Office of Radiation and Indoor Air, United States Environmental Protection Agency."},{"key":"ref_5","unstructured":"International Commission on Radiological Protection (2007). The 2007 Recommendations of the International Commission on Radiological Protection, ICRP. Annals of the ICRP 37, 1-332, ICRP Publication 103."},{"key":"ref_6","unstructured":"Li, Z., and Feng, C. (2011). Handbook of Radon, Nova Science Publishers, Inc."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"317","DOI":"10.1016\/j.envres.2014.10.002","article-title":"The microenvironmental modelling approach to assess children\u2019s exposure to air pollution\u2014A review","volume":"135","author":"Branco","year":"2014","journal-title":"Environ. Res."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"121","DOI":"10.1007\/s00247-006-0191-5","article-title":"Cancer risks following diagnostic and therapeutic radiation exposure in children","volume":"36","author":"Kleinerman","year":"2006","journal-title":"Pediatr. Radiol."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"622","DOI":"10.1289\/ehp.1408548","article-title":"Background ionizing radiation and the risk of childhood cancer: A census-based nationwide cohort study","volume":"123","author":"Spycher","year":"2015","journal-title":"Environ. Health Perspect."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"2229","DOI":"10.1007\/s10967-012-2272-2","article-title":"Radon concentrations in kindergartens and schools in two cities: Kalisz and Ostr\u00f3w Wielkopolski in Poland","volume":"295","author":"Bem","year":"2013","journal-title":"J. Radioanal. Nucl. Chem."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"315","DOI":"10.1111\/ina.12073","article-title":"Radon in indoor air of primary schools: A systematic survey to evaluate factors affecting radon concentration levels and their variability","volume":"24","author":"Bochicchio","year":"2014","journal-title":"Indoor Air"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"38","DOI":"10.1093\/rpd\/ncs143","article-title":"Thoron and radon measurements in Romanian schools","volume":"152","author":"Burghele","year":"2012","journal-title":"Radiat. Prot. Dosimetry."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"S91","DOI":"10.1051\/radiopro\/20116768s","article-title":"Measurement of indoor radon concentration and actual effective dose estimation of schools at high radon area in Korea","volume":"46","author":"Chang","year":"2011","journal-title":"Radioprotection"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"881","DOI":"10.1016\/j.jenvrad.2011.05.001","article-title":"Indoor radon levels in Greek schools","volume":"102","author":"Clouvas","year":"2011","journal-title":"J. Environ. Radioact."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"285","DOI":"10.1080\/10256016.2014.890338","article-title":"Radon survey and soil gamma doses in primary schools of Batman, Turkey","volume":"50","author":"Damla","year":"2014","journal-title":"Isotopes Environ. Health Stud."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"6","DOI":"10.1093\/rpd\/ncr094","article-title":"National radon survey in Korea","volume":"146","author":"Kim","year":"2011","journal-title":"Radiat. Prot. Dosimetry."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"278","DOI":"10.1093\/rpd\/ncr483","article-title":"Radon measurement in schools located in three priority investigation areas in the province of Quebec, Canada","volume":"151","author":"Poulin","year":"2012","journal-title":"Radiat. Prot. Dosimetry."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"273","DOI":"10.1088\/0952-4746\/29\/2\/N02","article-title":"Assessment of the dose received by students and staff in schools in the Rawalpindi region of Pakistan due to indoor radon","volume":"29","author":"Rahman","year":"2009","journal-title":"J. Radiol. Prot."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"214","DOI":"10.1177\/1420326X09347132","article-title":"Indoor radon survey in 120 schools situated in four districts of the Punjab Province\u2014Pakistan","volume":"19","author":"Rahman","year":"2010","journal-title":"Indoor Built Environ."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"152","DOI":"10.1093\/rpd\/ncu249","article-title":"Results from time integrated measurements of indoor radon, thoron and their decay product concentrations in schools in the Republic of Macedonia","volume":"162","author":"Stojanovska","year":"2014","journal-title":"Radiat. Prot. Dosimetry."},{"key":"ref_21","first-page":"S320","article-title":"Some results of a radon survey in 207 Serbian schools","volume":"58","author":"Zunic","year":"2013","journal-title":"Romanian J. Phys."},{"key":"ref_22","first-page":"294","article-title":"Investigating indoor radon levels and influencing factors in primary schools of Zulfi city, Saudi Arabia","volume":"1370","author":"Baig","year":"2011","journal-title":"AIP Conf. Proc."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"805","DOI":"10.1080\/15287394.2015.1051171","article-title":"Radon levels in nurseries and primary schools in Bragan\u00e7a district\u2014Preliminary assessment","volume":"78","author":"Sousa","year":"2015","journal-title":"J. Toxicol. Environ. Health Part. A"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"160","DOI":"10.1016\/j.jenvrad.2012.05.030","article-title":"Indoor radon levels in schools of South-East Italy","volume":"112","author":"Trevisi","year":"2012","journal-title":"J. Environ. Radioact."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"247","DOI":"10.1093\/rpd\/ncs232","article-title":"Radon and thoron doses in kindergartens and elementary schools","volume":"152","author":"Vaupotic","year":"2012","journal-title":"Radiat. Prot. Dosimetry."},{"key":"ref_26","first-page":"S328","article-title":"Radon measurement in schools and kindergartens Kremikovtsi municipality, Bulgaria","volume":"58","author":"Vuchkov","year":"2013","journal-title":"Romanian J. Phys."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"149","DOI":"10.1093\/rpd\/ncu073","article-title":"Influence of energy-saving measures on the radon concentration in some kindergartens in the Czech Republic","volume":"160","author":"Fojtikova","year":"2014","journal-title":"Radiat. Prot. Dosimetry."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"163","DOI":"10.1093\/rpd\/ncu251","article-title":"Measurement of indoor radon concentration in kindergartens in Sofia, Bulgaria","volume":"162","author":"Ivanova","year":"2014","journal-title":"Radiat. Prot. Dosimetry."},{"key":"ref_29","unstructured":"European Commission (2013). Laying down Basic Safety Standards for Protection against the Dangers Arising from Exposure to Ionising Radiation, European Commission."},{"key":"ref_30","unstructured":"(2013). Portaria n\u00b0 353-A\/2013. Minist\u00e9rios do Ambiente, Ordenamento do Territ\u00f3rio e Energia, da Sa\u00fade e da Solidariedade, Emprego e Seguran\u00e7a Social. Di\u00e1rio da Rep\u00fablica\u20141\u00aa S\u00e9rie, 253, 6644(2)\u20136644(9). (In Portuguese)."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"435","DOI":"10.1186\/1471-2458-12-435","article-title":"Indoor air pollution on nurseries and primary schools: Impact on childhood asthma\u2014Study protocol","volume":"12","author":"Sousa","year":"2012","journal-title":"BMC Public Health"},{"key":"ref_32","unstructured":"LNEG Carta Geol\u00f3gica de Portugal, na Escala 1:50,0000, Laborat\u00f3rio Nacional de Energia e Geologia. Available online: www.lneg.pt\/download\/2769\/cgp500k.pdf."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"41","DOI":"10.1016\/j.scitotenv.2004.02.011","article-title":"The influence of geological factors on indoor radon concentrations in Norway","volume":"328","author":"Sundal","year":"2004","journal-title":"Sci. Total Environ."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"2635","DOI":"10.1016\/j.scitotenv.2011.03.031","article-title":"A model to predict radon exhalation from walls to indoor air based on the exhalation from building material samples","volume":"409","author":"Sahoo","year":"2011","journal-title":"Sci. Total Environ."},{"key":"ref_35","doi-asserted-by":"crossref","unstructured":"ICRP (2014). Radiological Protection against Radon Exposure. ICRP Publication 126. Ann. ICRP, 43, 5\u201373.","DOI":"10.1177\/0146645314542212"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"4452","DOI":"10.1016\/j.scitotenv.2009.04.033","article-title":"Comparative risk assessment of residential radon exposures in two radon-prone areas, \u015etei (Romania) and Torrelodones (Spain)","volume":"407","author":"Sainz","year":"2009","journal-title":"Sci. Total Environ."}],"container-title":["International Journal of Environmental Research and Public Health"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1660-4601\/13\/4\/386\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T19:21:33Z","timestamp":1760210493000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1660-4601\/13\/4\/386"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2016,3,30]]},"references-count":36,"journal-issue":{"issue":"4","published-online":{"date-parts":[[2016,4]]}},"alternative-id":["ijerph13040386"],"URL":"https:\/\/doi.org\/10.3390\/ijerph13040386","relation":{},"ISSN":["1660-4601"],"issn-type":[{"value":"1660-4601","type":"electronic"}],"subject":[],"published":{"date-parts":[[2016,3,30]]}}}