6 documents found, page 1 of 1
Designing a Multicriteria WebGIS-Based Pre-Diagnosis Tool for Indoor Radon Pote...
Nunes, Leonel; Curado, António; Azevedo, Rolando; Silva, Joaquim P.; Lopes, Nuno; Lopes, Sérgio IvanRadon (222Rn) is a well-known source of indoor air contamination since in its gaseous form it is a reported source of ionizing radiation that belongs to the group of rare gases. Radon occurs naturally in soils and rocks and results from the radioactive decay of its longer-lived progenitors, i.e., radium, uranium, and thorium. Radon releases itself from the soil and rocks, which mainly occurs in outdoor environm...
Towards Indoor Radon Analytics: An OLAP-based Multidimensional Approach
Azevedo, Rolando; Silva, Joaquim P.; Lopes, Nuno; Curado, António; Nunes, Leonel J R; Lopes, Sérgio IvanIndoor radon represents a known hazard to public health, namely, its relationship with lung cancer. The adoption of data analytics tools for indoor radon human exposure risk assessment is crucial for building management decision-making and is a fundamental requirement for the implementation of remediation measures. This work presents the implementation of a data warehouse and an OLAP cube as components of a mor...
Designing an IoT-enabled Data Warehouse for Indoor Radon Time Series Analytics
Azevedo, Rolando; Silva, Joaquim P.; Lopes, Nuno; Curado, António; Nunes, Leonel J R; Lopes, Sérgio IRecently we have seen an increase in the frequency of radon concentration measurement campaigns, largely driven by directives adopted at a European level, and by increased public awareness of the problem. Many of the conducted assessments are simple concentration averages over a time range, where passive sensors are mostly used. Other assessments use portable devices that measure radon in a continuous mode, whi...
Indoor Radon Remediation in Highly Constrained Built Environments: Balancing In...
Curado, António; Nunes, Leonel J R; Silva, Joaquim P; Lopes, Nuno; Azevedo, Rolando; Lopes, Sérgio IvanEnergy Efficiency (EE) and Indoor Air Quality (IAQ) are mandatory features in the rehabilitation of historical buildings. Even though it is challenging to manage both sides, EE demands are fundamental to increasing buildings´ thermal comfort, and IAQ requirements are essential for improving occupants’ wellness. There are, however, several constraints that limit the intervention in complex buildings, such as the...
Short-Term Indoor Radon Gas Assessment in Granitic Public Buildings: A Multi-Pa...
Azevedo, Rolando; Silva, Joaquim P.; Lopes, Nuno; Curado, António; Lopes, Sérgio I.Radon is a naturally occurring radioactive gas formed in the soil with higher predominance in granitic zones. It is a well-known Indoor Air Quality (IAQ) parameter that is measured in higher radon risk zones. The proposed methodology begins with a unidimensional data characterization followed by a multidimensional analysis that will relate radon concentration with other parameters, i.e. Temperature, Relative Hu...
Short-term indoor radon gas study in a granitic school building: A comparative ...
Azevedo, Rolando; Silva, Joaquim P.; Lopes, Nuno; Curado, António; Lopes, Sérgio I.Granite territories continuously release radon, a radioactive gas that can be very harmful to human health. The assessment of radon gas indoor concentration is relevant for granitic buildings that lie over this substrate. In this work we use a sensor system to study the variation through time of indoor air quality (IAQ) parameters like radon concentration, temperature, and humidity following the occupation patt...