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2016
- handle: 10670/1.feof7p
- 0188-6266
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Acta Universitaria
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Soil Mould, Vegetable Vegetable mold Earth (Soils) Mold, VegetableCiter ce document
Luis Humberto Colmenero Sujo et al., « NORM determination in urban soils from selected cities in Chihuahua, Mexico », Acta Universitaria, ID : 10670/1.feof7p
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Résumé
"Soil radioactivity affects the human body. This study determinates the 238 U, 232 Th and 40 K activity (NORM) in 164 urban soils in 13 cities in the State of Chihuahua, Mexico. Absorbed Dose Rate and the Annual Effective Dose were also calculated. Activities were analyzed us- ing a coaxial hyper-pure germanium detector (HPGe), Ge Model 2020, Thermo and Dewar 7500 SL (CANBERRA brand). A one-way variance analysis (ANOVA) was performed and a Tukey test was applied to identify mean differences. Activity averages were 36.8 Bq kg –1 for 238 U, 41.4 Bq kg –1 for 232 Th and 805.7 Bq kg –1 for 40 K. Calculated absorbed dose rate ranged from 36 nGy h –1 to 83 nGy h –1 while Annual Effective Dose varied from 1.02 mSv y –1 to 0.44 mSv y –1 . Results suggest that some levels exceed global averages and are among the highest levels of natural radioactivity in the world."