@article{Mammba_Balobegwa_Muhulo_Pantaleo_Kawala_2021, title={Assessment of natural radioactivity and radiation hazards of building materials in Kinondoni District, Dar es Salaam, Tanzania}, volume={47}, url={http://tjs.udsm.ac.tz/index.php/tjs/article/view/673}, DOI={10.4314/tjs.v47i2.22}, abstractNote={<p>Natural radionuclides from building materials are one of the potential sources of external as well as internal radiation exposure to the human body. Currently, this exposure has been increasing since people spend more than  of their time indoors (ICRP 1991). Commonly used building materials from Kinondoni District were investigated using γ-spectrometry; their activity concentrations of <sup>226</sup>Ra, <sup>232</sup>Th and <sup>40</sup>K in Bq/kg were measured. The results showed that average values of activity concentrations of <sup>226</sup>Ra, <sup>232</sup>Th and <sup>40</sup>K were 15.62, 21.51 and 237.99 Bq/kg, respectively. All the activity concentrations in the studied samples were lower than the world average values of 35 Bq/kg for <sup>226</sup>Ra, 30 Bq/kg for <sup>232</sup>Th and 400 Bq/kg for <sup>40</sup>K. The radium equivalent activity ( ), external ( ), internal hazard index ( ) and gamma activity concentration index ( ) were calculated to assess the radiological hazards due to presence of natural radionuclides in the building materials.  The results showed that the average values of Ra<sub>eq</sub>, H<sub>ex</sub>, and I<sub>γ</sub> were 64.7 Bq/kg, 0.17, 0.21 and 0.24, respectively. These values were lower than the world criteria values 370 for Ra<sub>eq</sub>, ≤ 1 for H<sub>ex</sub>, ≤ 1 for H<sub>in</sub> and ≤ 1 for I<sub>γ</sub>, respectively. The obtained results indicated that all the investigated building materials were safe for inhabitants.</p> <p><strong>Keywords</strong>: Building materials, Natural radionuclides, Radiation hazards, Gamma ray spectrometry, Activity concentration.</p>}, number={2}, journal={Tanzania Journal of Science}, author={Mammba, Huruma P and Balobegwa, Vitus A and Muhulo, Alex P and Pantaleo, Peter A and Kawala, Remigius A}, year={2021}, month={May}, pages={664–673} }