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Summary
Samples of sand, stone and manufactured building materials collected from Karachi area have been analyzed for the primordial natural radionuclides 238U, 232Th and 40K using γ-ray spectrometry. The uranium and thorium contents have also been determined by instrumental neutron activation analysis (INAA). The specific activities in these materials, having a radium equivalent activity less than 370 Bq kg–1, when evaluated for radiological effects show that all materials meet the external γ-ray dose limitation of 1.5 mSv y–1. The γ-ray spectrometric and INAA techniques complemented each other well in this study.
Published Online: 2009-9-25
Published in Print: 2004-12-1
© 2004 Oldenbourg Wissenschaftsverlag GmbH
