NATURAL SOIL GAMMA RADIOACTIVITY LEVELS AND RESULTANT POPULATION DOSE IN THE CITIES OF ZACATECAS AND GUADALUPE, ZACATECAS, MEXICO
2003; Lippincott Williams & Wilkins; Volume: 84; Issue: 3 Linguagem: Inglês
10.1097/00004032-200303000-00010
ISSN1538-5159
AutoresF. Mireles, Julia Isabel Flores Dávila, L.L. Quirino, J. F. Lugo, Javier Pinedo, Claudia Adriana Calvillo Ríos,
Tópico(s)Geochemistry and Geologic Mapping
ResumoThe study of natural gamma radioactivity was made to determine the concentrations of natural radionuclides in soil. Twenty soil samples collected in the cities of Zacatecas and Guadalupe and their suburban areas in the Mexican state of Zacatecas were analyzed by gamma-ray spectrometry to determine the activity concentrations of 226Ra, 232Th, and 40K. Gamma-spectrometry measurements were made using a hyperpure germanium detector surrounded with shielding material to reduce the background counting rate. The GammaVision-32 MCA emulation software was used for gamma-ray spectrum analysis and the TRUMP card of 2k as a MCA emulator. Conversion factors were used to calculate the dose to the population from outdoor exposure to terrestrial gamma rays. The measured activity concentration of 226Ra varies from 11 to 38 Bq kg−1, the activity concentration of 232Th varies from 8 to 38 Bq kg−1. The activity concentration of 40K is in the range 309–1,049 Bq kg−1. The overall population mean outdoor terrestrial gamma dose rate is 44.94 nGy h−1.
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