The inside of reactor No. 4 is seen at the Fukushima Daiichi nuclear plant in Fukushima Prefecture, northeastern Japan, in this September 24, 2002 file photo.
March 15: 10:37am: “U.S. Navy Detects Low Radiation at Base 200 Miles From Japanese Nuclear Plant”
France advises citizens to leave city; higher radiation reported in Russian city 500 miles from stricken plant.
Dangerous levels of radiation leaking from a crippled nuclear plant forced Japan to order 140,000 people to seal themselves indoors Tuesday after an explosion and a fire escalated the crisis spawned by the earthquake and tsunami. REUTERS/Yomiuri Shimbun

A combination photo made of still images from video footage March 14, 2011, shows the explosion at Fukushima Daiichi nuclear power complex. A hydrogen explosion rocked a crippled nuclear power plant in Japan on Monday where authorities have been scrambling to avert a meltdown following Friday’s massive earthquake and tsunami. REUTERS/NTV via Reuters TV

A technician of the SERTIT, Regional Service of Image Treatment and Remote Sensing, points at a screen in his office in Illkirch Graffenstaden near Strasbourg, March 14, 2011 showing a satellite image of the region of the two Fukushima nuclear plants in Japan. The satellite image was taken on March 12, 2011, a day after the major earthquake and tsunami hit the region. The red squares on the map indicate the impacted areas in the region. REUTERS/Vincent Kessler
Instruments for the measurement of nuclear radiation to send to Swiss Rescue workers in Japan, are pictured at the Swiss Agency for Development and Cooperation (DEZA) logistic – centre in Wabern March 14, 2011. A magnitude 8.9 earthquake and tsunami which struck northern Japan on Friday. REUTERS/Pascal Lauener
A mother tries to talk to her daughter who has been isolated for signs of radiation after evacuating from the vicinity of Fukushima’s nuclear plants, at a makeshift facility to screen, cleanse and isolate people with high radiation levels in Nihonmatsu, northern Japan, March 14, 2011, after a massive earthquake and tsunami that are feared to have killed more than 10,000 people. REUTERS/Yuriko Nakao