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Use of hand-held gamma-ray spectrometry to assess decay of granite ashlars in h...
Santomé, Ana C. Hernández; Sanjurjo-Sánchez, Jorge; Alves, C.Non-destructive methods are widely demanded in research on Cultural Heritage. In the last years, several techniques have been proposed, attempted and even routinely tried on research on assessing the deterioration of stone of Cultural Heritage buildings and monuments. We test here the use of hand-held gamma-ray spectrometry (GRS) to assess the decay of stone in two Heritage buildings. GRS is a non-destructive t...
El "Forno de Santa" y "Basílica da Ascensión" de Santa Mariña de Augas Santas (...
Blanco-Rotea, Rebeca; Vázquez, Cruz Ferro; Quintela, Marco V. García; Sanjurjo-Sánchez, JorgeLa sauna ubicada en el lugar de Armea, en la parroquia de Santa Mariña de Augas Santas (Allariz, Ourense) representa un caso singular dentro del panorama de las saunas protohistóricas expuesto en el libro "Saunas protohistóricas en Iberia" editado por A. Villa Valdés y M.V. García Quintela. Podemos destacar cuatro aspectos sobre la sauna: 1) Es el único edificio termal todavía en uso, no como sauna sino como lu...
Estimating the radioactive heat production of a granitic rock in the University...
Sanjurjo-Sánchez, Jorge; Barrientos Rodríguez, Victor; Arce Chamorro, Carlos; Alves, C.Geothermal energy is a form of renewable energy with a long tradition in European countries, although it is scarcely used in Spain. One of the reasons for this is the poorly studied geothermal potential of the Spanish territory. In recent years, data published on terrestrial gamma radiation and the geochemistry of radioisotopes in rocks have suggested that the radiogenic heat production (RHP) in some areas of S...
Effects of water on natural stone in the built environment - a review
Alves, C.; Figueiredo, Carlos A. M.; Sanjurjo-Sánchez, Jorge; Hernández, Ana C.The present work reviews studies with information on the effects of water by itself on stones of the built environment both to assess the impact of this substance and to discuss possible implications for conservation. The analysis concerns empirical results from previous publications dealing with the effects, on several rock types, of freeze–thaw, wetting, erosion by running water and substances resulting from ...
Salt weathering of natural stone: a review of comparative laboratory studies
Alves, C.; Figueiredo, Carlos A. M.; Sanjurjo-Sánchez, Jorge; Hernández, Ana C.Natural stone is an important component of historical heritage (buildings and art objects such as sculptures or rock engravings), and it is still widely used in contemporary works. Soluble salts are the main erosive agent in the built environment, and we review here comparative studies that subject the same rock type to testing with different salt solutions. The results mostly support the accepted notion of the...
Territories of faith: 1000 years of landscape multifunctionality in Santa Mariñ...
Ferro-Vázquez, Cruz; Blanco-Rotea, Rebeca; Sanjurjo-Sánchez, Jorge; García-Rodríguez, Sonia; García Quintela, MarcoLandscape multifunctionality is increasingly recognized as an important aspect in sustainability and developmental debates. Yet, how and why a multifunctional landscape configuration develops over time has not been sufficiently studied. Here we present the geoarchaeological investigation of the Santa Mariña de Augas Santas site, in northwestern Spain. We focus on the role of religious practice, and of its inter...
Rock features and alteration of stone materials used for the built environment:...
Alves, C.; Figueiredo, Carlos; Sanjurjo-Sánchez, JorgeThis work presents a review of recent publications, with publication date between 2017 and 2019, with information on the relation between rock characteristics and the effects of diverse agents associated with alteration of stone materials in the built environment. It considers information obtained from ageing tests performed under laboratory conditions and by exposure to outdoor agents. Several lithological gro...
Electronic systems and offsite touristic activities based on geological concept...
Alves, C.; Figueiredo, Carlos; Sanjurjo-Sánchez, JorgeThe COVID-19 pandemic has caused havoc in many economic areas such as those related to tourism. This creates the need for alternative activities in this sector, especially given that it is not clear when the present emergency will end and there could be new situations of this kind. We consider here two main possibilities (virtual models and remote observations) for tourism related to geological objects (includi...
Dating the early Christian baptisteries from Idanha-a-Velha—the Suebi-Visigothi...
Fernández, Adolfo Fernández; Carvalho, Pedro Jorge Cardoso de; Cristóvão, José; Sanjurjo-Sánchez, Jorge; Dias, PatríciaThe results of the excavations carried out by one of the authors in the early Christian baptisteries of Idanha-a-Velha, in Suebi- Visigothic Egitania, are presented. Chronostratigraphic data (stratigraphic sequence, typological analysis) are compared with radiocarbon and luminescence dates in order to establish a hypothesis concerning the construction date of both north and south baptisteries. The results have ...
Geological materials as sources of Rn emissions
Alves, C.; Sanjurjo-Sánchez, JorgeGeological materials are a potential source of pollutants, among which there is the radioactive isotope 222Rn, which result of radioactive decay of daughter radionuclides of uranium (238U). It is emitted as a gas that it can be released to the air to enter the human body, with the potential to affect internal organs (mostly the lungs) by alpha particles production. While the presence of uranium in the materials...