A representative survey of indoor radon in the sixteen regions in Mexico City
| Autor: | Guillermo Espinosa, Richard B. Gammage |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Meteorological Concepts
chemistry.chemical_element Radon Radiation Monitoring Mexico city Chemical contaminants Air Pollution Radioactive Radiology Nuclear Medicine and imaging Mexico Sea level Population Density Hydrology Radiation Radiological and Ultrasound Technology Altitude Urban Health Public Health Environmental and Occupational Health General Medicine Oak Ridge National Laboratory Health Surveys Aerosol chemistry Nuclear track Air Pollution Indoor Housing Radiation monitoring Environmental science |
| Zdroj: | Radiation Protection Dosimetry. 103:73-76 |
| ISSN: | 1742-3406 0144-8420 |
| DOI: | 10.1093/oxfordjournals.rpd.a006119 |
| Popis: | Mexico City, also called Federal District, covers an area of 1504 km 2 , and has more than 8 million inhabitants. It is located more than 2200 m above sea level in a zone of high seismic activity, and founded on an ancient lake. At present it is one of the most crowded and contaminated cities in the world, with thermal inversions. Chemical contaminants and aerosol particles in the environmental air are high most of the year. Due to these geological, environmental and socioeconomic conditions, Federal District presents very peculiar characteristics, which are important for understanding the distribution and measurements of indoor radon concentration. In this work the results of 3 year (1998-2000) measurements of indoor radon levels in the Federal District are presented. For the detector distribution and measurements, the actual political administrative divisions of the Federal District, consisting of 16 very well defined zones, was used. Nuclear track detection methodology was selected for the measurement, with a passive device close-end-cup system with CR-39 (Lantrack®) polycarbonate as the detection material, with one step chemical etching, following a very well established protocol developed at the Instituto de Fisica, UNAM. Calibration was carried out at the Oak Ridge National Laboratory, and verification at the Instituto de Fisica chamber. The results show that the arithmetical mean values of the indoor radon concentration for each region of the Federal District follow a non-homogenous distribution. |
| Databáze: | OpenAIRE |
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