Examination of quantity and local distribution of strontium Pollutant in falling dust on the city of Yazd surface

Falling dust is containing particles with smaller than 100 microns in size, which is deposited on the surface. Dust has an important role in transforming environmental pollutants. Strontium is one of these pollutants that are released into the atmosphere from natural and human sources and is falling to the ground by dust. Due to strontium has joint transportation routes with calcium can lead to hazards to human health. There are also radioactive isotopes of strontium; including strontium 90 is very harmful due to impaired blood flow. In this study the distribution and abundance of strontium, strontium isotopes found in the mist was falling. After selecting of the sampling stations with appropriate distribution in the city of Yazd is used sediment traps of marbles and dust samples were taken monthly for a year. In order to investigate the changes in the concentration of strontium in samples of dust from the X-ray fluorescence system and for the determination of strontium radioisotopes Geiger Muller instrument was used. Zoning map and local distribution of strontium in the city was prepared in Arc GIS software. The study results showed that the highest concentration of strontium is from the East to the city center and the lowest amount is related to the North West. Zoning results showed that the highest quantity of the strontium in the city center is from Kashani Street to the field Mahdieh. Radioactive isotopes of strontium showed that the samples are lacked radioactive isotopes. So there isn’t any environmental risk from radio isotopes of strontium in falling dust.