68.6 Bq/Kg of Cesium was measured from one of the major brands of Japanese tea.
It’s “Itoen“, measured by a citizen’s group in Nagano.
The sample was the tea leaves which are actually sold in the market.
Measurement : 1/9/2012
Cs134 : 25.4 Bq/Kg
Cs137 : 43.2 Bq/Kg
(Source)
Iori Mochizuki