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We measured powdered milk and liquid milk from this summer through
September.
As ordinary citizens, we wonder why radioactive cesium is detected in
powdered milk.
Is it related to the regions where the raw milk is sourced?
Is it impossible to manufacture products with no detectable levels?
When we ask the manufacturers, however, they do not disclose any details.
Moreover, because the measured values are far below the national limit
(50 Bq/kg), they do not seem to treat the issue with much seriousness.
Still, we suspect that different sources of raw milk may be used
depending on the product, because follow up milk (for infants around one
year old and above) consistently shows higher readings than newborn
formula (for newborns and up).
It has been fourteen and a half years since the Fukushima nuclear
accident, and overall levels should be declining due to natural decay.
However, some concerning patterns remain — brands that had consistently
shown ND (not detected) have suddenly begun showing detectable levels,
and some values that were previously in the double digits have risen
into the triple digits.
Please also refer to the graphs below the table.
If you single click the table of results, the images will enlarge and
become easier to view.

Since August 24, 2023, the discharge of treated water accumulated at the Fukushima Daiichi Nuclear Power Plant into the Pacific Ocean has begun. Therefore, in December 2023, seawater samples were collected and the concentration of cesium-137 was compared with seawater samples collected before July. This time, in July and August 2024, the third round of seawater sampling was conducted, and the results have been added.

All measurements were conducted for 259,200 seconds using a germanium semiconductor detector (GCD-70200).

For the measurement of tap water or seawater, extremely low detection limits are required. Tap water is also not “ND” (Not Detected). Before March 11, 2011, the nationwide average radioactivity level in tap water was 0.04 mBq/kg (Japan Chemical Analysis Center: FY2008 analysis data). According to environmental radiation monitoring surveys conducted around nuclear facilities, seawater measurements (outside Fukushima) typically show results of approximately 1–3 mBq/kg, regardless of location.

At our measurement facility, with the cooperation of the Citizens’ Nuclear Information Center, we employ a concentration method called the AMP method. Using a chemical reagent known as ammonium phosphomolybdate, we concentrate a 40–50 L sample over a period of about three days. The concentrated sample is then measured for a long duration using a germanium semiconductor detector.

We measure drinking water around you (including spring water and well
water) as well as seawater in each area. Please consult us regarding the
sample quantity and fees.

In June of this year, measurements were conducted on 12　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.

We put the results of urine monitoring from January to December 2024　together. 
(N=202, We picked up only the first result of those who were monitored multiple times.)  

Below are the results of radiation measurement.

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 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 put the results of urine monitoring from January to December 2023　together. 
(N=159, We picked up only the first result of those who were monitored multiple times.)  

Below are the results of radiation measurement.

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.

On August 24, 2023, the discharge of radioactive contaminated water from
Fukushima Daiichi Nuclear Power Station (FDNPS) began.

We collected seawater samples around FDNPS in December of that year and
analyzed the concentration of radioactive cesium-137 to compare with the
data before the release.

Radioactive cesium concentration analysis was performed using the
AMP(Ammonium molybdophosphate) method in cooperation with CNIC.

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.