Please be assured that there is nothing to worry about. We test each crop of matcha for various hazards, including radiation and heavy metal contamination. Satisfying these tests are required for our factories to maintain their food safety grading and licenses, which are needed to continue operations.  The government of Japan also conducts its own separate radiation testing on all food products, and the results are consistently negative. The results are public information and are published in English on the website of the Japanese Ministry of Health, Labour and Welfare.