Not to mention, Cesium 134 and 137 are measured from incineration ash in Tokyo, Iodine 131 is still measured at variety of the facilities.
It can be seen both of the ash and the sludge.
(Bq/Kg)
Minato incineration plant (12/21/2011) : 439 (Ash) / 1,050(Sludge)
Itabashi incineration plant (12/22/2011) : 223(Ash) / 210(Sludge)
Ash
Sludge
Iori Mochizuki