Monitoring the concentration of ۲۳۸U, ۲۳۲Th, ۴۰K and ۱۳۷Cs of soil in Anarak-Khour district, Central Iran

This study was conducted to determine the radioactivity concentration in soil samples of Anarak-Khour district located at central Iran. ۴۸ soil samples from a depth of ۱۰-۱۵ cm were taken from seven different sites for monitoring. The radioactivity concentration of ۲۳۸U, ۲۳۲Th, ۱۳۷Cs and ۴۰K in soil samples was determined, using a high resolution (HPGe detector, p-type) γ-spectrometry by detectors with ۵۵% and ۳۸.۵% relative efficiencies. The results showed that the radioactivity concentration ranged from ۹.۹۱ ± ۰.۱۱ to ۴۴۷۹.۹۵ ± ۰.۱۵ Bq.kg-۱ for ۲۳۸U, from ۵.۹۵ ± ۰.۱۴ to ۳۸۹.۷۲ ± ۰.۱۰ Bq.kg-۱ for ۲۳۲Th, ≤MDA to ۸.۸۹ ± ۰.۱۳ Bq.kg-۱ for ۱۳۷Cs and from ۱۲۳.۱۸ ± ۰.۲۷ to ۵۲۰۱.۴۲ ± ۰.۲۷ Bq.kg-۱ for ۴۰K in soil samples. The calculated internal and external hazard indices were more than ۱ in some sites which showed a high dose for this area. These results could be used as a database of this area because it might be used as a nuclear waste site in the future.

کلیدواژه ها:

Radioactivity concentration ، Gamma spectrometry ، Soil ، Anarak-khour