Radioactivity concentrations in sediments and their correlation to the coastal structure in Kuwait.

Gamma-ray spectrometric measurements were performed on sediment samples from the coast of Kuwait to study the concentration of natural as well as man-made radioactive sources. The coast of Kuwait, which extends for some 170 km is mainly soft sedimentary colitic limestones or sandstones, overlaid in many areas with beach or wind-blown sand. In the north, suspended material from the Shatt Al-Arab delta has settled to form extensive soft areas of intertidal mud within Kuwait Bay. Forty samples were taken at different points along the coast in undisturbed areas at intervals of about 5 km. Collection was carried out during low-tide, where it was possible to collect sediments from the wet region that was covered by seawater during the high tide. At each of the sample sites, a sampling area of about 1 m2 was considered. Samples collected from the north were of a muddy nature, whereas the southern samples were sandy. All samples were left to dry in open air before drying in the oven at 105 degrees C for 2-3 days to remove all water content. The radioactivity in southern areas reaches about one half of the values commonly assigned as the world average. In the northern areas, higher radioactivity concentrations are found but are still below the international levels.

Comparative study of desert truffles from Kuwait and other countries in the Middle East for radionuclide concentration.

Concentrations of some radionuclides, including 137Cs, in desert truffles in Kuwait were studied and compared with similar samples from other countries in the Middle East, namely Iran, Egypt, and Tunisia. In addition, sand samples from Kuwait were assayed to calculate the transfer factor of the radionuclides under consideration. The measured concentrations of 40K, 226Ra, and 137Cs show that 137Cs is much higher in Egyptian samples, whereas 40K is much lower in samples from Tunisia. The average effective dose equivalent calculated for the Kuwaiti population according to their diet habits was found to be in the range 0.14-0.23 microSv/a. The results are compared with values from other countries.