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Here we determined the  90 Sr concentrations in the teeth of cattle abandoned in the evacuation area of the Fukushima-Daiichi Nuclear Power Plant (FNPP) accident.  90 Sr activity concentrations in the teeth varied from 6–831 mBq (g Ca) −1  and exhibited a positive relationship with the degree of radioactive contamination that the cattle experienced. Even within an individual animal, the specific activity of  90 Sr (Bq (g Sr) −1 ) varied depending on the development stage of the teeth during the FNPP accident: teeth that were early in development exhibited high  90 Sr specific activities, while teeth that were late in development exhibited low specific activities. These findings demonstrate that  90 Sr is incorporated into the teeth during tooth development; thus, tooth  90 Sr activity concentrations reflect environmental  90 Sr levels during tooth formation. Assessment of  90 Sr in teeth could provide useful information about internal exposure to  90 Sr radiation and allow for the measurement of time-course changes in the degree of environmental  90 Sr pollution.

90Sr in teeth of cattle abandoned in evacuation zone: Record of pollution from the Fukushima-Daiichi Nuclear Power Plant accident