As I was grabbing some breakfast this morning, I caught the following bit of news about a radiation hot-spot in Setagaya-ku, Tokyo. Turns out, this may have nothing to do with Fukushima (and of course everyone assumed it did), which is funny because that blows out of the water the assumption that there ain’t no loose-flying radiation in Japan except what got rattled loose in the 3/11 earthquake-tsunami. Oops!

東京都世田谷区弦巻の区道で最大で毎時3.35マイクロシーベルトと周辺より高い放射線量が検出された問題で、文部科学省は13日、発生源とみられる隣接する民家の床下にあったビンの中身について、放射性ラジウムと推定されると明らかにした。放射性セシウムは検出されなかったことから、福島第1原発事故とは関係ないと断定した。

via 世田谷の放射線、発生源はラジウム 原発事故と無関係  :日本経済新聞.

And here’s an English update, which manages to raise as many questions as it answers. And another one here. I note that a resident alerted the authorities on this one: so there are enough nervous residents in Tokyo even who go out with Geiger counters and take readings.