Studying natural Radionuclides in water and sediments of Tehran

Category Environmetal Geology
Group GSI.IR
Location The 25 Symposium of Geosciences
Author P.Pruzfar-F.Rahmani-A.Yaghub pour-A.Aftabi-R.Ata pour-N.Rastkhah-J.Amidi-P.Behnia-R.Nobari
Holding Date 02 July 2007
 

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.

 

tags: TEHRANQAZVIN