Studying natural Radionuclides in water and sediments of Tehran

Studying natural Radionuclides in water and sediments of Tehran

1:100000 geologic maps   (Tehran, Karaj, and Shahryar 1:50000 sheets)

Abstract:

The natural Radionuclides have Longley existed in the Earth and in  environment around us such as Water, Soil, air  and body. Now it's very important to study and understand Radionuclides resources. The surveyed region includes Tehran, Karaj, Shahryar 1:50000 sheets (located on geologic map of Tehran 1:100000).

Regarding close relation between water and sediment  geochemistry and their direct effect on human and other creatures' health, water and sediment have been simultaneously studied here. samples were analyzed in Atomic Energy organization laboratory for measuring natural Radionuclides ⁴⁰ K  ²²⁶Ra   ²³² Th and  The artificial Radio Nuclides ¹³⁷Cs for sediments  and elements such as  ²²⁶Ra  ¹³⁷Cs  ²²²Rn  U ^total And  ( β ، α) for water samples. The results were compared with EQGS Canada (2003), 1053 Iran, and EPA American standards. The results indicates that  ²³² Th  in sediment  sampels of karaj and shahryar in comparision with UNSCEAR standard is normal but the average of ⁴⁰ K and  ²²⁶Ra are greater than standard . existence of  ¹³⁷Cs  in sediments is from antropogenic resources ( nuclear activities). It indicated that average amount of Radionuclides is very close to each other in ground and surfacial water. Comparing the average concentration of this radionuclide with existing standards revealed that all measured samples are for less than risk limit and aren't deemed as a threat.

It should be mentioned that existing research is the first researches with such a vast realm and various survey parameters. Needless to say that accessing more meticulous data and finding geogetic relation between Radionuclides and geological units require complementary studies in smaller scales.