Strontium 90 Readings From Citizen Collected Fukushima Samples

Some Fukushima contamination samples collected by citizens in Japan have been tested for strontium 90.

Marco Kaltofan from the Dept. of Civil and Environmental Engineering at Worcester Polytechnic Institute tested two existing samples, one being an air filter and the other a sample of black sand found near the evacuation zone. The results were posted to Safecast’s public email list.

The detection limits are higher than I would like, at about 10 Bq/g.  Even so, I got some good results for some of my existing samples.  The sample of black sand from Namie had been reported last year at 1530 Bq/g of radiocesium.  The 90Sr level for this sample was 348 Bq/g.  An air filter sample taken in June 2011 in Fukushima City was 2792 Bq/filter radiocesium, and 668 Bq/filter 90Sr.  These were quantified against a 2700 Bq 90Sr source from Oak Ridge, TN, USA.  For these two samples, 90Sr is about 23 % of the level of 134Cs and 137Cs combined.”
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