According to the food measurement result of Citizen’s radioactivity measuring station,
not to menation,Cs-134,137 were measured,but Iodine131 was also measured from various rice samples.
Since this is a private institution,their measurement result is more honest then government’s.
Most of the samples were taken from 10/1~10/20/2011.
This may prove Fukushima went back to recriticality state in September.
Even though Iodine131 remains longer than 7 days,considering it is measured from sewage sludge,soil,in Tokyo,Iwate and Saitama,it may be rational to think Fukushima goes to recriticality state on and off.
Overview
(Bq/kg)
Rice from Miyagi Sample taken 2011-10-01 Measured 2011-10-23 Iodine 131 <1.92 Measurement tool AT1320A
Rice from Kawamatacho Fukushima Sample taken 2011-10-20 Measured 2011-10-26 Iodine 131 4.09±2.51 Measurement tool AT1320A
Rice from Kawamatacho Fukushima Sample taken 2011-10-20 Measured 2011-10-26 Iodine131 3.23±2.63 Measurement tool AT1320A
Rice from Kawamatacho Fukushima Sample taken 2011-10-10 Measured 2011-10-27 Iodine131 4.61±2.57 Measurement tool AT1320A
(Source)