Following up this article http://fukushima-diary.com/2012/01/breaking-news-after-the-earthquake-of-11-fukushima-had-fall-out-more-than-30-days-of-nov/
They measured rapid increase of fallout in Fukushima from 1/2 ~ 1/3/2012, but they also measured fallout in Inage Chiba.
From 10/31/2011 ~ 12/26/2011, they had not measured Cs-134 and 137, but they measured 54 Bq/m2 of them.
Iori Mochizuki