TEPCO REPORTS IN JAPAN TIMES (hat tip energy newshttp://enenews.com/ 4/18:
In the No. 3 reactor building, the robots detected a radiation level of 28 to 57 millisieverts per hour on the ground floor.
In the No. 1 reactor building, radiation was measured at between 10 and 49 millisieverts per hour. On Saturday, workers detected 270 millisieverts per hour on the south side of the same floor in the No. 1 unit, Tepco said http://search.japantimes.co.jp/cgi-bin/nn20110419a1.html
Data summary available here http://www.guardian.co.uk/news/datablog/2011/mar/18/japan-nuclear-power-plant-updates?INTCMP=SRCH
Japan is reporting the disaster will be ongoing for 9 months http://www.bbc.co.uk/news/world-asia-pacific-13107846