  The airborne radioactive isotopes from the Fukushima Daiichi nuclear plan t
was measured in Tokushima, western Japan. The continuous monitoring has been
carried out in Tokushima. From March 23, 2011 the fission product $^{131}$I was
observed. The radioisotopes $^{134}$Cs and $^{137}$Cs were also observed in the
beginning of April. However the densities were extremely smaller than the
Japanese regulation of radioisotopes.
