Friday, February 24, 2012

Radioactive Shiitake Mushrooms from Inzai City, Chiba at 993 Bq/Kg

Inzai City is located in the northwest corner of Chiba where the radiation levels remain elevated.

From Asahi Shinbun (2/23/2012):


On February 23, the Japanese government ordered the governor of Chiba Prefecture to halt shipment of shiitake mushrooms grown in Inzai City in Chiba Prefecture. 993 becquerels/kg of radioactive cesium, exceeding the national provisional limit of 500 becquerels/kg, was detected on February 22.

The amount of radioactive cesium detected is nearly 10 times the amount of the new safety limit to be put into effect on April 1.

Still, many people don't seem to care, and the schools continue to use shiitake mushrooms, raw or dried, in their school lunches to feed small children.


Anonymous said...

Sad, remember a comment..the "mystical ability" to withstand radiation. Guess this is part of "Japanese Samuri Spirit"? Sad the children may not have the opportunity to actually GROW up..This is not a fairy tale ending up happy ever after.

Chibaguy said...

So I live in this city and had slightly offended all my neighbors a long time ago. Basically, before 3/11 we would all share produce we grew. After seeing professors Hayakawa map I got a hold of a gieger counter and measured my area. Let's get say the rest of my neighbors stop offering us produce or fish caught off the pacific as I would always ask where it was from. Two things surprise me; one is that the neighbors still do this even though every single park in Inzai has had its top soil removed and still is just sitting in vinyl bags by fences as they have no where to put it. Secondly, why it take so long for the government to figure this out?

Anonymous said...

Yet more fucking stupidity from the japanese... Never ending

netudiant said...

It would be useful to know if this measured wet or dried mushrooms, as the impact on the measurement is large. Mushrooms are 90% water, so the standard could be met for dried mushrooms merely by rehydrating them.

arevamirpal::laprimavera said...

These are fresh mushrooms. Multiplier they seem to use in Japan to figure out the dried mushroom Bq/kg is 7.

Atomfritz said...

Probably these mushrooms were grown in halls and not in the open.

Mushrooms collected in the forests will probably be way more contaminated.

The area in Germany where I live was very hard hit by Chernobyl fallout (it rained down here).
Sometimes mushrooms collected in the forests still measure around 10000 Bq/kg. The health ministry here strongly advises to avoid non-commercially-grown mushrooms even 25 years after the accident.

I am sure that similiarly radiant mushrooms could be found in the Fukushima forests regularly too, if anybody cared for regular surveying.

netudiant said...

It may be relevant to note that fungi do seem to preferentially take up cesium from the soil, as has been noted by a Japanese researcher in another story covered on this blog.
Combine that knowledge with Atomfritz's useful little tidbit about ongoing mushroom contamination in Germany, one might reasonably want to avoid mushrooms in Japan for a little while, perhaps a century or two.

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