ABSTRACT

We present a numerical study carried out with the SPRINTARS model modified to account for the radioactive decay of ³⁵S compounds emitted from the Fukushima Daiichi nuclear power plant station after the hydrogen and vapor blast. The transport dynamics of the released material reproduced previous field observations. Four different emission scenarios were compared to the measurements of atmospheric ³⁵S in sulfate collected in La Jolla, Tsukuba, Kashiwa and Yokohama. Linear regressions of the relation between emitted and transported material that reached the sampling sites were used to estimate the amount of ³⁵S atoms and the amount of neutrons released in to the atmosphere. We estimate that a lower limit of 1.9 × 10^{16 35}S atoms sec^-1 were released after the events in March and this flux dropped to 4-39 × 10^{14 35}S atoms sec^-1 at the end of the month. Based on this calculations we estimated a lower limit of 5.2 × 10²¹ slow neutrons m^-2 sec^-1 were emitted from the nuclear fuel rods to the sea water injected in the reactors after the events in March.