Day 414 Cesium in maccha from Aichi / Mie Prefectures

(UPDATED) 66 Bq/Kg of Radioactive Cesium From Maccha Green Tea

Some readers were wondering if radioactive cesium had been detected in the type of Japanese green tea in fine powder – maccha (抹茶). So I googled it, and up came the report by Seikatsu Club (co-op), as follows:


Maccha  早春の香 (Shinsei Watarai-cha): total cesium 11 Bq/kg. Tea was made [into maccha form] in April.
Maccha  早春の香 (Shinsei Watarai-cha): total cesium  66 Bq/kg. Tea was made [into maccha form] in March.

Maccha  早春の香 (Shinsei Watarai-cha): total cesium 37 Bq/kg. Tea was made [into maccha form] in April.

There is no information when the tea was picked.

Shinsei Watarai-cha is an organic tea grown in Watarai-cho in Mie Prefecture.

On checking the environmental database by Japan Chemical Analysis Center, I’ve found that the highest level of radioactive cesium (Cs-137) in green tea in Mie Prefecture was in 1988 at 2.9 becquerels/kg. In the past 10 years, it was either “not detected” or less than 0.1 becquerels/kg.

Watarai-cho is located just southwest of Ise City in Mie. Ise City is famous for the Ise Grand Shrine.

By the way, Mie Prefecture is accepting the disaster debris from Iwate and Miyagi. The governor of Mie signed the agreements with his counterparts in Iwate and Miyagi, despite oppositions from mayors in Mie, including the mayor of Ise City and the mayor of Watarai-cho.

UPDATE: comments from people I follow on Twitter:

Kontan_Bigcat: 7 to 9 becquerels/kg of cesium was detected last year from tea in Mie.

Kouta Kinoshita: it is possible that the number is high relative to the level of contamination in Mie, because the tea was organically grown.


The tea that was made into maccha tea was from Aichi Prefecture, east of Mie Prefecture, even though the company who made the maccha tea is a tea grower and blender in Mie Prefecture.

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Japanese Seaweed Radiation Doubles

Michael Collins

On Apr 13, 2012 tested Nori seaweed from Japan bought in a West Los Angeles store, the same one where this reporter bought the identical item eight months ago soon after the Fukushima Daiichi meltdowns began in Japan. The trendy and ‘organic’ delicacy, popular with LA hipsters, was 94.7% above normal, 17.6% of that additional ionization indicative of alpha radiation which can be 60 to 1,000 times more dangerous than beta and gamma radiation.

These tests were performed with an Inspector Alert nuclear radiation monitor, the same detector has used in over 1,500 tests for Fukushima radiation beginning four days after the March 11, 2011 triple meltdowns at the destroyed Fukushima Daiichi six-reactor complex in Japan.


Last year, the seaweed was 54.2% higher than background therefore experienced a 10.0% decrease in ionization over nearly 8 months. That translates to a 15.4% decrease of the radionuclide(s) per year while in the bag.

Removed from the bag, the older seaweed was 55.0% higher than the previous background with 10.8% of background exceedance being alpha radiation. Last year, this same seaweed test out of the bag 67.2% above background meaning that it had decreased 12.2% in ionization for the period, or an 18.8% decrease including the alpha.

Read the entire article at:

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(UPDATED) Last Year’s Green Tea from Tokyo Found with 210 Bq/kg of Radioactive Cesium (by the Old Testing Method)

(UPDATE from Security Tokyo on April 29, 2012:

Cs-134: 86 becquerels/kg
Cs-137: 128 becquerels/kg
Total: 214 becquerels/kg

Margin of error (Cs-137): 5 becquerels/kg


The number is below the provisional safety limit of 500 becquerels/kg that was in effect till April 1 this year, and would be above the new safety limit of 100 becquerels/kg if the testing method for green tea remained the same.

Well it didn’t. Starting April 1, 2012, you only test green tea after it’s brewed, and test the liquid. If that tests less than 10 becquerels/kg, it is supposed to be “safe” as far as the regulation goes.

But Security Tokyo, a private entity that has been conducting the very precise, professional measuring of radioactive materials using the calibrated germanium semiconductor detector, is testing the green tea (“Sayama-cha”) made in Tokyo last year the old way – measuring the dry leaves.

Article continues at:

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Local official purged for being against spreading radiation

Posted by Mochizuki on April 28th, 2012

Mr. Murata Tomoaki, a town councilor of Manazuru town in Kanagawareceived resignation advisory resolution from town council.

He is blamed for commenting they should not spread radioactive incineration ash from Kanto to western Japan on twitter.

In January, groundwater of disposal site turned out to be contaminated because of incineration ash from Yugawara town and Manazuru town, incineration ash became unable to be process in Kanagawa prefecture. Yugawara town is known to be Onsen resort place, Manazuru town is known for fishery products.
Health unions of both towns were asking a private disposal site in Nara to take the incineration ash. Having this situation, on 3/3/2012, Mr. Murata tweeted, incineration ash from Kanto is more contaminated than western Japan. It spreads radiation to all over Japan so he is against it. The ash should be process in Kanagawa prefecture.

Similar comments followed his tweet, the private disposal site decided not to accept the contaminated incineration ash on 3/7/2012.
The unions are seeking for other disposal site, the ash is kept out of the town at the moment.
The radiation level was 144 ~ 490 Bq/Kg.

Manazuru town council blames him for mentioning radioactive contamination on twitter, want him to take “moral responsibility“.
On 4/27/2012, Manazuru town councilor passed resignation resolution recommendations of him.

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Tokyo Suburb: Children playing on dirt with “huge amounts of radioactivity” — Includes alpha particles — Cesium levels so high it prevented identification of other isotopes

Title: Radio-isotopic Analysis of Post-Fukushima Accident Japanese Soil Samples
Author: Thomas Watson
Date: March 3, 2012

At 7:10 in

  • Kashiwa City soil near rain spout from someone’s yard @ 97,500 Bq/kg […]
  • That is an exceeding large amount of radioactivity to find in somebody’s soil.
  • The most unfortunate place was in a child’s playground, also in Kashiwa City.
  • This playground had a radioactivity in dirt that children play on of @ 41,500 Bq/kg.
  • I detected Cs-137 and Cs-134.They were so high they clouded everything else. There was nothing else I was able to detect as a result of it.
  • Very active, huge amounts of radioactivity.
  • Little children play on this everyday.
Article continues at:

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