Natural Radioactivity Measurement and Dose Assessment in Soil Samples from Some Selected Areas of Mali
- 1 Département de Physique, Université des Sciences, des Techniques et Technologies de Bamako, Bamako, Mali
- 2 Département de Physique, Université des Sciences, des Techniques et Technologies de Bamako, Bamako, Mali
- 3 Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg, Strasbourg, France
Abstract
This is the first time that a study applies the gamma ray spectroscopy using a high purity germanium to evaluate the terrestrial gamma radiation level by detector in selected regions of Mali. The results reveal that the activity concentrations of naturally occurring 226 Ra, 232 Th and 40 K radionuclides ranges between respectively 17.26 ± 1.81 and 105.43 ± 10.36; 20.41 ± 2.52 and 180.85 ± 19.69; 41.33 ± 8.26 and 627.63 ± 85.62 Bq ⋅ kg − 1 . The measures of radium equivalent activity ( Ra eq ), absorbed dose rates (ADR), annual effective dose rate (AEDR), external hazard index ( H ex ), internal hazard index ( H in ) and excess lifetime cancer risk (ELCR) were evaluated. Some of the obtained values exceed the recommended safe levels. Further studies are necessary to constitute a baseline reference data about the terrestrial radiation in Mali.
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