Available in: http://www.redalyc.org/articulo.oa?id=56841415 Red de Revistas Científicas de América Latina, el Caribe, España y Portugal Sistema de Información Científica A. Canoba, F. O. López, M. I. Arnaud, A. A. Oliveira, R. S. Neman, J. C. Hadler, P. J. Iunes, S. R. Paulo, A. M. Osorio, R. Aparecido, C Rodríguez, R. Vasquez, G. Espinosa, J. I. Golzarri, T. Martínez Indoor radon measurements in six Latin American countries Geofísica Internacional, vol. 41, núm. 4, october-december, 2002, pp. 453-457, Universidad Nacional Autónoma de México México How to cite Complete issue More information about this article Journal's homepage Geofísica Internacional, ISSN (Printed Version): 0016-7169 silvia@geofisica.unam.mx Universidad Nacional Autónoma de México México www.redalyc.org Non-Profit Academic Project, developed under the Open Acces Initiative http://www.redalyc.org http://www.redalyc.org/comocitar.oa?id=56841415 http://www.redalyc.org/fasciculo.oa?id=568&numero=2635 http://www.redalyc.org/articulo.oa?id=56841415 http://www.redalyc.org/revista.oa?id=568 http://www.redalyc.org/articulo.oa?id=56841415 http://www.redalyc.org/revista.oa?id=568 http://www.redalyc.org/revista.oa?id=568 http://www.redalyc.org http://www.redalyc.org/revista.oa?id=568 Indoor radon measurements in six Latin American countries A. Canoba1, F. O. López1, M. I. Arnaud1, A. A. Oliveira1, R. S. Neman2, J. C. Hadler2, P. J. Iunes2, S. R. Paulo2, A. M. Osorio3, R. Aparecido3, C. Rodríguez3, V. Moreno4, R. Vasquez4, G. Espinosa5, J. I. Golzarri5, T. Martínez6, M. Navarrete6, I. Cabrera6, N. Segovia7, P. Peña7, E. Taméz7, P. Pereyra 8, M. E. López- Herrera8 and L. Sajo-Bohus9 1 Autoridad Reguladora Nuclear. Buenos Aires, Argentina. 2 Instituto de Física, UNICAMP, Campinas, Sao Pablo, Brazil. 3 Universidad Estadual Paulista, Sao Pablo, Brazil. 4 Comisión Ecuatoriana de Energía Atómica, Quito, Ecuador. 5 Instituto de Física, UNAM., México, D.F., México. 6 Facultad de Química, UNAM., México, D.F., México. 7 ININ, México, D.F., México. 8 Pontificia Universidad Católica de Perú, Lima, Perú. 9 Universidad Simón Bolivar, Caracas, Venezuela. Received: September 2, 2001; accepted: February 27, 2002. RESUMEN De acuerdo con las guías internacionales vigentes respecto a problemas de contaminación radiológica ambiental, es necesario evaluar y conocer los niveles de radón intramuros, especialmente debido a que el radón y sus hijos son el principal causante de la dosis de radiación natural que recibe el ser humano. Algunos países han establecido instituciones y programas nacionales encargadas del estudio del radón y su interrelación con el cáncer pulmonar y la salud pública. En este trabajo se presentan mediciones de radón intramuros en algunos países latinoamericanos, siendo los participantes Argentina, Brasil, Ecuador, México, Perú y Venezuela. Se usaron diferentes tecnologías y métodos para este esfuerzo común, presentando los niveles de radón intramuros en lugares específicos de cada uno de los países participantes. Finalmente, este trabajo fue hecho con el ánimo de integrar las instituciones latinoamericanas avocadas a las mediciones de radón intramuros. PALABRAS CLAVE: Radón intramuros, detección de radón, países de Latinoamerica. ABSTRACT Most of the natural radiation dose to man comes from radon gas and its progeny. Several countries have established national institutions and national programs in charge of the study of radon and its connection with lung cancer risk and public health. In this paper an indoor radon measurements in Latin American countries is presented. The participants in this work were from Argentina, Brazil, Ecuador, Mexico, Peru and Venezuela. Many different techniques are used in this common effort, and the indoor radon levels in specific locations in each of the participant countries are presented. KEYWORDS: Indoor radon, radon detection, Latin American countries. INTRODUCTION Residential exposure to radon has been considered an important environmental risk factor for lung cancer. Since 1986, US EPA has recommended that all dwell- ings below the third floor be tested for the presence of in- door radon and be mitigated in homes with levels exceeding 148 Bq/m3, to reduce indoor radon. Until now, in some Latin American countries such regulations do not exist, but it is the responsibility of the governments to investigate and ascertain the indoor radon levels in the respective countries in order to identify the population radiological risks, such as lung cancer. This has been the motivation to perform the present work, gathering the information on indoor radon levels in the Latin Ameri- can countries. 453 Geofísica Internacional (2002), Vol. 41, Num. 4, pp. 453-457 454 A. Canoba et al. Moreover, indoor radon levels in working areas are con- sidered in the legal regulations for environmental contami- nants, for the benefit of the working people and public health (IAEA, 1998; US-EPA, 1992). Many efforts have been made to choose a laboratory set-up for radon monitoring which could be conveniently and rapidly adopted by all the regional laboratories and transfer these radon monitoring units to any laboratory in develop- ing countries in a co-operative research program. These sen- tences were expressed by L Tommasino, G. Furlan, H.A. Khan and M. Monnin in the late of 80´s. (Tomassino et al., 1989). But, still in the year 2000, Latin American countries have the same problem, and we are looking for cooperation projects basically within the cited region, USA and Euro- pean countries, to create regional laboratories for radon mea- surements and public health studies. This work was compiled from the participation of the laboratories shown in Table 1. LOCATIONS AND INDOOR RADON LEVELS REPORTED Table 2 shows the locations where indoor radon was measured and indoor radon levels reported (Espinosa and Gammage, 1997; Espinosa and Gammage, 1998; Espinosa and Gammage, 1999; Espinosa et al., 1999; Franco-Marina et al., 2001; Martínez et al., 1998; Sajo-Bohus et al., 1999; Segovia and Cejudo, 1984; Segovia et al., 1993; Segovia et al., 1995; Segovia et al., 1997). As we can see, presently there are measurements of indoor radon levels in an important number of cities through- out Argentina and Mexico, and also in some highly popu- lated cities and some capital cities of other participating coun- tries. The geographical distribution of measurements is shown in Figure 1. DATA ANALYSIS AND RESULTS From the information of Table 2 we evaluate the maxi- mum, minimum and average values contained in Table 3. Figure 2 is a graph showing the distribution average values, most of which are below 100 Bq/m3 and all of them are be- low the limit of 148 Bq/m3. CONCLUSIONS The obtained results may be used in future public health studies, including the eventual establishment of patterns for indoor radon distribution in Latin American countries, in- corporating these patterns to the existing studies in countries of North America, Europe, Asia and Oceania. The work could be an implementation of a Latin Ameri- can Environmental Radiation Network (LAERNET). This work was done under the coordination of Dr. G. Espinosa (IFUNAM-Mexico). All the data and results are responsibility of each research group. Table 1 List of Participant Institutions Ref. No. Country Institution Name Institution Clasification Objective 1 ARGENTINA Autoridad Reguladora Nuclear National Lab. Services 2 BRAZIL Instituto de Física, UNICAMP University Research 3 BRAZIL Universidad Estadual Paulista University Research 4 ECUADOR Comisión Ecuatoriana de Energía Atómica National Lab. Reserach 5 MEXICO Instituto de Física, UNAM University Research 6 MEXICO Facultad de Química, UNAM University Research 7 MEXICO Instituto Nacional de Investigaciones Nucleares National Lab. Research 8 PERU Pontificia Universidad Católica de Perú University Research 9 VENEZUELA Universidad Simón Bolívar University Research 455 Indoor radon in Latin America Fig. 2. Distribution of indoor radon average values that are reported in Table 2. Fig. 1. Geographical distribution of countries, in gray and cities measured; the site location codes are given in Table 2. 0 2 4 6 8 10 12 14 0-20 20-40 40-60 60-80 80-100 100-120 120-140 <140 Radon (Bq/m3) Fr eq ue nc y (a u) 456 A. Canoba et al. Table 2 Radon levels measurements in the different locations in Latin American countries. No. Country Code Site Number of Indoor Radon Level Dwellings (Bq/m3) Max Min Mean 1 ARGENTINA 1 Bariloche 18 59.0 28.2 36.0 1 ARGENTINA 2 Buenos Aires 354 235.0 6.0 26.0 1 ARGENTINA 3 Córdoba 154 198.0 5.0 23.3 1 ARGENTINA 4 Corrientes 109 286.0 4.0 48.0 1 ARGENTINA 5 Cosquín 70 211.0 5.0 48.2 1 ARGENTINA 6 Gral Alvear 106 145.5 5.0 45.0 1 ARGENTINA 7 Malargue 239 250.0 9.0 38.9 1 ARGENTINA 8 Mendoza 139 256.0 4.4 49.6 1 ARGENTINA 9 Prov. De Chubut 70 74.5 6.0 33.0 1 ARGENTINA 10 Resistencia 35 131.5 12.6 49.0 1 ARGENTINA 11 Rosario 61 220.0 18.0 31.0 1 ARGENTINA 12 San Luis 204 84.3 10.0 30.7 1 ARGENTINA 13 San Rafael 413 116.0 7.0 30.8 1 ARGENTINA 14 Santiago de Estero 62 81.9 5.0 28.0 2 BRAZIL 15 Campinas-SP (summer) 70 254.5 16.7 77.6 2 BRAZIL 15 Campinas-SP (winter) 70 310.0 26.3 86.3 3 BRAZIL 16 Sao Paulo State, Presidente Prudente City. 180 262.7 7.03 79.92 4 ECUADOR 17 Quito (DC Zone) 14 157.40 49.41 87.1 4 ECUADOR 17 Quito (CP Zone) 17 160.39 20.39 77.6 4 ECUADOR 17 Quito (CV Zone) 14 225.66 36.38 117.8 4 ECUADOR 17 Quito (LG Zone) 16 207.66 37.43 94.7 5 MEXICO 18 Aguascalientes, Ags. 180 130 39 61 5 MEXICO 19 Chihuahua, Chih. 250 273 42 135 5 MEXICO 20 Guadalajara, Jal. 250 190 37 117 5 MEXICO 21 Hermosillo, Son 250 157 27 91 5 MEXICO 22 León, Gto. 250 130 20 67 5 MEXICO 23 Mexico City 400 217 15 84 5 MEXICO 24 Monterrey, NL. 250 280 45 97 5 MEXICO 25 Morelia, Mich. 250 165 15 45 5 MEXICO 26 Pachuca, Hgo. 200 187 20 120 5 MEXICO 27 Puebla, Pue. 250 101 49 72 5 MEXICO 28 Querétaro, Qro. 180 163 15 61 5 MEXICO 29 San Luis Potosí, SLP. 180 148 15 49 6 MEXICO 23 Metropolitan Zone * 300 55 90 6 MEXICO 23 Metropolitan Zone, (winter) * 276 43 86 7 MEXICO 30 Metepec, Lerma 320 40.7 7.1 17.8 7 MEXICO 23 Mexico City 500 103.7 15 14.3 7 MEXICO 23 Mexico City 500 296 15 33.5 7 MEXICO 27 Puebla 100 59.5 48.4 54.0 7 MEXICO 31 Toluca 200 44.7 15 17.9 7 MEXICO 32 Zacatecas 120 86.0 14.0 46.2 8 PERU 33 Lima (CAPU-PUCP) 84 42.66 18.57 30.62 8 PERU 33 Lima (Library, PUCP) 84 50.20 25.70 33.97 9 VENEZUELA 34 Caracas 75 - - 35 9 VENEZUELA 35 Estado Barinas 68 346 15 70 * No information 457 Indoor radon in Latin America BIBLIOGRAPHY ESPINOSA, G. and R. 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Radon monitoring in radiopro- tection, environmental radioactivity and earth sciences. World Scientific, Singapore. US-EPA, 1992. Environmental Protection Agency Report No. EPA 400-R-92-011. ______________ A. Canoba1, F.O. López1, M.I. Arnaud1, A.A. Oli- veira1, R.S. Neman2, J.C. Hadler2, P.J. Iunes2, S.R. Paulo2, A.M. Osorio3, R. Aparecido3, C. Rodrí- guez3, V. Moreno4, R. Vasquez4, G. Espinosa5, J.I. Golzarri5, T. Martínez6, M. Navarrete6, I. Cabrera6, N. Segovia7, P. Peña7, E. Taméz7, P. Pereyra8, M. E. López-Herrera8 and L. Sajo-Bohus9 1 Autoridad Reguladora Nuclear, Av. Libertadores 8250. Buenos Aires, Argentina 2 Instituto de Física, UNICAMP, 13083-970, Campinas, Sao Pablo, Brazil 3 Universidad Estadual Paulista, Sao Pablo, Brazil 4 Comisión Ecuatoriana de Energía Atómica, P.O. Box 17- 01-2517, Quito, Ecuador 5 Instituto de Física, UNAM. Apdo. Postal 20-364. 01000, México, D.F., México 6 Facultad de Química, UNAM, Edificio D, Cd. Universitaria, México, D.F., México 7 ININ, Apdo. Postal 18-1027, 11801 México, D.F., México 8 Pontificia Universidad Católica de Perú. Apdo. Postal 1761, Lima 100, Perú 9 Universidad Simón Bolivar, P.O. Box 89000, Caracas, Venezuela Correspondig author: Guillermo Espinosa; phone (52)652 25051; Fax: (52) 563 51254. Email: espinosa@fisica.unam.mx Table 3 Maximum, minimum and average indoor radon levels Ref . No. Country Indoor Radon Level (Bq/m3) Max Min Mean 1 ARGENTINA 286.0 15 36.96 2 BRAZIL 310.0 16.7 81.95 3 BRAZIL 262.7 15 79.92 4 ECUADOR 225.66 20.39 94.30 5 MEXICO 280 15 83.25 6 MEXICO 300 43 88.00 7 MEXICO 103.7 15 30.62 8 PERU 50.20 18.57 32.29 9 VENEZUELA 346 15 52.50