Specific Activity and Distribution of ⁹⁰Sr in Desert Plants

The specific activity and distribution of ⁹⁰Sr in desert plants benefit not only to the assessment of its pollution situation but also to the survey of ⁹⁰Sr hyperaccumulation plants. Seven desert plants, phragmites autstralis, lycium ruthenicum, hexinia polydichotoma, halogeton glomeratus, tamarix hispida, calligonum mongolicum and halocnermum strobilaceum, which from a contaminated site were collected, and the specific activities of ⁹⁰Sr in these plants were determined. The influence factors such as plant species, tissue, live stages were studied. The plants are slightly contaminated by ⁹⁰Sr with the average specific activity of (3.6±4.3) mBq/g, which depend on plant species, live stages and variational in different tissue. The specific activity of ⁹⁰Sr in these desert plant is decreased as halogeton glomeratus>hexinia polydichotoma>lycium ruthenicum>tamarix hispida>phragmites autstralis>calligonum mongolicum>halocnermum strobilaceum. The specific activity of a (⁹⁰Sr) in growing plants is higher than that in grown ones. For the different tissues of phragmites autstralis, a (⁹⁰Sr) decreases in the sequency of roots>leaves≈tassels>stems. The specific activity of ⁹⁰Sr in plants analysed as fetched is higher than that had been rinsed, that means resuspension is the main source of the contamination.