A government report revealed that mushroom grown in Japan's Yamanashi prefecture had excessive levels of radioactive cesium, with a recorded level of 150 becquerels per kilogram (Bq/kg). This surpasses the allowed cesium level of 100 Bq/kg in the country. The mushroom was thankfully not circulated in the market and the Ministry of Health, Labor and Welfare regularly publishes test results of radioactive substances in food.