Measure of activities and activity ratios

of U And Ra radio-isotopes in some natural water samples

In the Western Sahara at the sud of Morocco


O.-K. Hakam*, A. Choukri, E. Alibrahmi, H. Bounouira

Equipe de Physique et Techniques Nucléaires, Laboratoire de Physique de la Matière et Rayonnement,  Université Ibn Tofail, Faculté des Sciences, P.B 133, 14000, Kénitra, Morocco.

* Corresponding author. E-mail:

Received: 12 December 2006; revised version accepted: 16 September 2007



     The preliminary results of 238U, 234U, 226Ra, 228Ra and 228Th activities and of 234U/238U, 228Ra/226Ra, 228Th/228Ra and 226Ra/238U activity ratios obtained for 8 wells, 5 drillings, 2 springs and 3 tap water samples collected in Laayoune and Es-Smara regions in the Moroccan Sahara are given in this work. The analyzed natural water samples have been collected from sources situated in a desert region rich in phosphates. Except for the one water drilling sample no used by population, the calculation of equivalent doses to the maximal activities for each isotope show that all measured activities are inferior to the maximum  contaminant levels recommended by the International Commission of Radioprotection and they don't present any risk for population health.


Keywords: Uranium; Radium; Thorium; Phosphates; Moroccan Sahara; Natural water.
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