Radioactive material measurement of school lunch ingredients in nursery schools

In April 2012, the “New Standards for Radioactive Materials in Foods” (Standards stipulated in Article 11, Paragraph 1 of the Food Sanitation Law), which also considers the impact on children, is required to ensure the safety and security of foodstuffs used in school lunch.
Therefore, since August 2012, Yokohama City has been measuring radioactive materials in the main ingredients used in school lunch before eating, to ensure safety and security.
From April 2014, the method of selecting the measured ingredients has been changed and implemented.

We conduct radionuclides analysis using germanium semiconductor detectors for school lunch ingredients at one place per day (measured by the date provided by school lunch) for school lunch on Wednesday, Thursday and Friday (excluding holidays, the year-end and New Year holidays and the next day).

Japan Oil Certification Association

Germanium semiconductor detectors
Detection limit: ３Bq/kg

Radioactive cesium (Cesium-134, Cesium-137)

We measure the following ingredients in the school lunch menu on the day at measurement facilities.
Number of specimens measured: Up to 4 items

1. Rice, milk
2. Ingredients whose standard value (100 Bq / kg) or more than 1/2 of radioactive cesium was detected nationwide between April 1, 2023 and February 29, 2024.
3. Other items deemed necessary

※For specific items in item 2, refer to the Ministry of Health, Labour and Welfare's “Inspection of Radioactive Materials on Agriculture, Livestock and Fisheries” (No. 4 issued by Kensei on March 26, 2024) (PDF: 389KB).

Measurement results will be published on the Child and Youth Bureau website on the day of the school lunch implementation.
Measurement results for FY2023
Measurement results for FY2022
Measurement results for FY2021
Measurement results for FY2020
※Test results before March 2020 are not currently disclosed.