One of the scientific researchers that I follow who goes by the name of "Tomynyo" on Twitter has been measuring all sorts of things after the Fukushima nuclear accident - soil accumulated on top of his apartment complex in Yokohama City with high levels of radioactive cesium to bamboo shoots and mushrooms served in the kindergarten lunch.
His latest tweets is not about the domestic mushrooms but about mushrooms from Italy:
イタリア製のボルチーニ茸6検体を測定したところ全ての検体からセシウム137が検出されました。 最大は170.3±18.0Bq/kg、最低は31.6±6.2Bq/kgでした。スーパーの乾椎茸はほとんど九州産ですから、普通に買える乾椎茸より汚染されていると思います (link)
We measured 6 samples of [dried] Italian porcini mushrooms, and all samples were found with cesium-137. Maximum was 170.3±18.0Bq/kg, and minimum was 31.6±6.2Bq/kg. Dried mushroom you buy at a supermarket are almost all grown in Kyushu, so we think these Italian mushrooms are more contaminated than the dried Japanese mushrooms you can buy at a supermarket.
If porcini mushrooms get rehydrated, the density of radioactive cesium would be one-fourths, we are told. We should recognize that we may have been eating food with certain levels of contamination even before March 11, 2011.
Just like the wood pellets from trees in Shikoku, Japan tested by one of my Twitter followers, cesium-137 is most likely from the atmospheric testing and the Chernobyl accident.
I happened on this video, supposed to be the raw footage of Chernobyl soon after the accident. I got scared watching workers with scant protection dumping loads of what looks like concrete debris:
Other "Long Shadow of Chernobyl" posts: