High natural background radiation areas
Ramsar, Iran
Ramsar, Iran
Ramsar is the city located along the Caspian Sea north of the mountain range of Elburz. There are many hot-springs in the city which have high radium concentrations. The city is well-known as a convention venue for the famous Ramsar Convention on Wet Land.
 |
City of Ramsar north of the Elburz range. |
|
Teheran: south of the Elburz range.
|
 |
 |
The highest indoor dose in Ramsar was 28μGy/h. On a wall surface it was as high as 130μGy/h. Based on an analysis by a γ-ray spectrometry it was shown that main components of radiations are Ra-226 and its daughter products. Daily dose for inhabitants there was assumed to be 0.19mGy/d, i.e., 71mGy/y. |
|
Out-door dose rates were dependent on the distribution of hot-spring residues including Ra-226. In some places it was 22μGy/h at 1 m high and 73μGy/h on the surface. |
 |
 |
Maharat is a new high natural radiation area made of Ra-226 residues 230 km south-west of Teheran. There are only hot-springs without any residents. |
 |
|
|
Ladies are wearing black clothes to cover all the skin with scarf on the head even at work. |
 |
|
|
|
|