A sample of powdered tea imported from the Japanese prefecture of Chiba, just southeast of Tokyo, contained traces of radioactive cesium 137, the Hong Kong government announced late Thursday evening, but they were far below the legal maximum level.  http://www.nytimes.com/2015/03/13/world/asia/hong-kong-finds-radioactive-contamination-in-sample-of-japanese-tea.html?ref=world
The discovery was not the first of its kind. The government’s Center for Food Safety found three samples of vegetables from Japan with “unsatisfactory” levels of radioactive contaminants in March 2011, the month that nuclear reactors in Fukushima, northeast of Tokyo, suffered partial meltdowns following a powerful earthquake and tsunami.
Other samples of Japanese food have occasionally been found to have low levels of radiation since the Fukushima disaster, the Hong Kong food center said.
Some tea samples were found in Japan with radioactive contamination in the months immediately after the earthquake and tsunami. Tea plants can live at least 30 years and sometimes much longer.
The importer of the tea sampled in Hong Kong voluntarily withdrew it from the market.