Though the data of SPEEDI was concealed not to cause a panic just after 311,
Japanese government sent on-going simulation data of SPEEDI to US army.
Command center of US army in Japan asked for radiation information on 3/14/2011.
Ministry of Foreign Affairs of Japan asked SPEEDI data from Nuclear Safety Technology Center through Ministry of Education, Culture, Sports, Science and Technology to forward it to US army every hour.
US army was receiving the information at least until July.
At least for now, Nobody is to take responsibility of having Japanese citizen exposed.
(Source)
Iori Mochizuki