Assessment of natural radioactivity and radiation hazards of building materials in Kinondoni District, Dar es Salaam, Tanzania

Authors

  • Huruma P Mammba Eastern Zone, Tanzania Atomic Energy Commission (TAEC), P. O. Box 80479, Dar es Salaam, Tanzania
  • Vitus A Balobegwa Eastern Zone, Tanzania Atomic Energy Commission (TAEC), P. O. Box 80479, Dar es Salaam, Tanzania
  • Alex P Muhulo Eastern Zone, Tanzania Atomic Energy Commission (TAEC), P. O. Box 80479, Dar es Salaam, Tanzania
  • Peter A Pantaleo Tanzania Atomic Energy Commission (TAEC) Headquarters, P. O. Box 743, Arusha, Tanzania
  • Remigius A Kawala Tanzania Atomic Energy Commission (TAEC) Headquarters, P. O. Box 743, Arusha, Tanzania

DOI:

https://doi.org/10.4314/tjs.v47i2.22

Keywords:

Building materials, Natural radionuclides, Radiation hazards, Gamma ray spectrometry, Activity concentration

Abstract

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 226Ra, 232Th and 40K in Bq/kg were measured. The results showed that average values of activity concentrations of 226Ra, 232Th and 40K 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 226Ra, 30 Bq/kg for 232Th and 400 Bq/kg for 40K. 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 Raeq, Hex, and Iγ were 64.7 Bq/kg, 0.17, 0.21 and 0.24, respectively. These values were lower than the world criteria values 370 for Raeq, ≤ 1 for Hex, ≤ 1 for Hin and ≤ 1 for Iγ, respectively. The obtained results indicated that all the investigated building materials were safe for inhabitants.

Keywords: Building materials, Natural radionuclides, Radiation hazards, Gamma ray spectrometry, Activity concentration.

Downloads

Download data is not yet available.

Downloads

Published

27-05-2021

How to Cite

Mammba, H. P., Balobegwa, V. A., Muhulo, A. P., Pantaleo, P. A., & Kawala, R. A. (2021). Assessment of natural radioactivity and radiation hazards of building materials in Kinondoni District, Dar es Salaam, Tanzania. Tanzania Journal of Science, 47(2), 664–673. https://doi.org/10.4314/tjs.v47i2.22

Issue

Section

Articles