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Since August 24, 2023, the process of releasing treated water accumulated
at the Fukushima Daiichi Nuclear Power Plant operated by Tokyo Electric Power Company into the Pacific Ocean commenced.
Consequently, in December 2023,
seawater samples were collected and compared with seawater samples from before July in terms of cesium-137 concentration.

※Each measurement was conducted for 259,200 seconds using a germanium semiconductor detector (GCD-70200).

To measure tap water and seawater, extremely low detection limits are required. Tap water is not nondetectable (ND).
Before 3/11, tap water had an average of 0.04 mBq/kg nationwide (Japan Analysis Center: Analysis of FY 2008).
According to the environmental radiation monitoring surveyaround nuclear facilities,
seawater at any location (except Fukushima) shows measurement results of approximately 1 to 3 mBq/kg.

At our measurement facility, with the cooperation of the Nuclear Material Information Office, we employ a concentration method called the AMP method.
Using a chemical called ammonium phosphomolybdate, we concentrate samples of 40 to 50 liters over about three days.
These samples are then measured for an extended period using a germanium semiconductor detector.

In December of last year, measurements were conducted on 11 different brands of commercially available yogurt. Below is a summary of the measurement results:

• mBq/kg represents 1/1000 Bq/kg. ND stands for Not Detected, and NA stands for Not Applicable.
• Please note that even if the product names are the same, the origins of the raw milk may vary.
• The selection of brands is at the discretion of the measurement requester.

Clicking on the table will enlarge the image for easier viewing.

In August of last year, measurements were conducted on 37 different brands of commercially available milk.
Below is a summary of the measurement results:

mBq/kg represents 1/1000 Bq/kg. ND stands for Not Detected, and NA stands for Not Applicable.

• Please note that even if the product names are the same, the origins of the raw milk may vary.
• The selection of brands is at the discretion of the measurement requester.

Clicking on the table will enlarge the image for easier viewing.

We put the results of urine monitoring from January to December 2022　together. 
(N=, We picked up only the first result of those who were monitored multiple times.)  
We totaled the results of people except 20 people whose results were N.D.

We monitored yogurt product samples that are commercially distributed in the market this year as well.
The add-ups are below.
The unit is mBq/kg. Please be careful not to misread.
If you single-click on the table of the results, images will be magnified and will get easy to see.

We monitored milk product samples that are commercially distributed in the market this year as well.
The add-ups are below.
The unit is mBq/kg. Please be careful not to misread.
If you single-click on the table of the results, images will be magnified and will get easy to see.

We monitored powder milk and liquid milk products that are commercially distributed in the market this year as well.
The add-ups are below.
The unit is mBq/kg. Please be careful not to misread.
If you single-click on the table of the results, images will be magnified and will get easy to see. 

We put the results of urine monitoring from January to December 2021 together. 
(N=31, We picked up only the first result of those who were monitored multiple times.)  
We totaled the results of people except 20 people whose results were N.D.

Below are the results of radiation measurement.
Since the number of samples drastically decreased due to COVIT-19, we only
the distribution by radiation levels and regions.

We put the results of urine monitoring from January to December 2020 together. 
(N=60, We picked up only the first result of those who were monitored multiple times.)  
We totaled the results of people except 18 people whose results were N.D.

Below are the results of radiation measurement.
Since the number of samples drastically decreased due to COVIT-19, we only
the distribution by radiation levels and regions.