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Anomalous ratios of radioisotopes in PM10 as tracer of global fallout impact in the centre of Mexico

Carmen Grisel Méndez-García, Elizabeth Teresita Romero-Guzmán

2018esaerosolsradioactive nuclidesenrichment factorMexicoICP-SFMS

Abstract

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The monitoring and evaluation of radioactive content in samples of PM10 aerosols have been investigated. The specific radioactivity concentrations (SRC) of 234U, 235U, 238U and 232Th were determined using inductively coupled plasma-sector field mass spectrometry in 13 samples collected in Mexico City and 8 samples collected in Cuernavaca in the centre of Mexico. The SRC of the radioisotopes analysed in PM10 were larger than those reported in PM2.5. The enrichment factor was greater than 5, indicating anthropogenic influences in both sites. The activity ratios of these isotopes in the samples were determined. The 235U/238U ratio showed variations with respect to the natural value, while the 234U/238U and 232Th/238U ratios did not show any secular equilibrium in all sites, corroborating that the increase of uranium is not influenced by natural sources. The annual dose results obtained have no impact on health.

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Cite This Work

@article{2e70beae-4b04-4911-95af-f3fe92158dbc,
  title={Anomalous ratios of radioisotopes in PM10 as tracer of global fallout impact in the centre of Mexico},
  author={Carmen Grisel Méndez-García and Elizabeth Teresita Romero-Guzmán},
  year={2018},
  language={es}
}
TY  - JOUR
TI  - Anomalous ratios of radioisotopes in PM10 as tracer of global fallout impact in the centre of Mexico
AU  - Carmen Grisel Méndez-García
AU  - Elizabeth Teresita Romero-Guzmán
PY  - 2018
LA  - es
ER  -

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