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  • 1 Universidad Nacional Autónoma de México Instituto de Física Apartado Postal 20-364 México, D.F. México
  • | 2 Instituto Nacional de Investigaciones Nucleares Km. 36.5 Carretera Mexico-Toluca La Marquesa, Ocoyoacac 52750 Estado de México
  • | 3 Universidad Nacional Autónoma de México, Circuito Institutos, Ciudad Universitaria Instituto de Geofísica 04510 México, D.F. México
  • | 4 Universidad Nacional Autónoma de México, Edificio D, Ciudad Universitaria Facultad de Química 04510 México, D.F. México
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The preliminary results of indoor radon concentration measurements taken in some of Mexico City’s colonial churches and convents are presented. Measurements were taken in the churches of Santa Catarina, La Conchita, San Juan Bautista, San Antonio Panzacola, San Diego and San Mateo and the church and convent complex of El Carmen. These structures are all located in Coyoacan, a borough of Mexico City. Indoor radon concentrations in churches and convents constructed in the 17th and 18th centuries are interesting for several reasons. Most of these buildings were built using the stones of ancient Mexican pyramids, mainly blocks of basalt and volcanic pyroclastic rocks, and possess walls between 40 cm and 70 cm thick and naves with large volumes of air and relative low ventilation. The churches are public places with people most of the time. The indoor radon concentrations were measured using nuclear track detectors consisting of a closed-end cup containing CR-39 Lantrack® polymer as detector material. The measurements were taken over four periods of three consecutive months. The results show indoor radon concentrations of between 82 and 165 Bq·m−3, below to the United States Environmental Protection Agency (USEPA) indoor radon action level for workplaces. Using these results, the radiological risks were calculated and found to be negligible.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
per Year
per Year
Founder Akadémiai Kiadó
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)