Quantify the costs of this delay?
Another 80k early deaths, several hundred thousand stricken by radiation diseases, reduced overall population fertility, multiple generations of reduced fertility and increased birth defects? More or less?
A huge swath of Japan is no longer arable, how is the country going to feed itself going forward?
That area was already a rust belt with a very high median age, the survivors are the descendants of a distinguishable independent culture and nation in the region, and the local culture will be washed away as evacuee refugees and disperse within my lifetime.
according to this site, 20 millisevierts a year is the exposure they allow airline workers, over a 5-year period, with 50 milliseverts in the worst year.
A pregnant woman flying 100 hours between the U.S. and Britain would exceed the recommended yearly dose for a fetus.