Radiation affecting Japan's famous delicacies 01 Apr 2012 On Sunday, Japan reopened parts of the no-go zone around the Fukushima nuclear plant, but is still banning people from staying overnight. The government is also warning people to avoid hundreds of locally-produced foods that exceed safe radiation limits. CBS News reports that the ban is affecting one of the country's best-known foods. With Fukushima's forests heavily contaminated by radiation, the oak he needs to raise shiitake mushrooms is gone. Shiitake, which tend to absorb radioactive cesium now in the soil, are especially shunned.