Evaluation and correction of Sr-90 value in bones quantified by online solid phase ICP-MS

Matsueda, Makoto   ; Koarai, Kazuma   ; Yanagisawa, Kayo*; Fujiwara, Kenso ; Kitamura, Akihiro   

Sr-90 accumulates in hard tissues such as bones and teeth in the case of uptake into the human or animal bodies. Therefore, the analysis of these hard tissues from the viewpoint of exposure evaluation has required, but the conventional radioactivity analysis requires a period of about one month, it is difficult to process a large number of samples. From this thing, we tried to apply application of the online solid phase extraction/ICP-MS method which can be measured quickly compared to radioactivity analysis. This method has mainly been utilizing as the analysis of Sr-90 contained in the water samples such as rainwater, and it has already equipped the correction functions corresponding to the shift of recovery rate at the Sr resin and the sensitivity shift in ICP-MS. However, hard tissues contain a large amount of matrix. Therefore, we investigated whether the isobaric interference, stable Sr, and other high matrix influence to Sr-90 values and attempted to correct the values.