Plutonium-239 contamination 23,000 times worse than previously admitted?!

The blogger EX-SKF has reported that, if information that the Japanese federal Nuclear and Industrial Safety Agency (NISA) admitted in a press conference is correct, then through straightforward mathematical calculation, plutonium-239 contamination levels resulting from the Fukushima Daiichi nuclear catastrophe may be 23,000 times worse than previously admitted. However, NISA later backpedalled from the statement which led to this conclusion. The fact remains that earlier this month, EX-SKF received word from colleagues that Neptunium-239 was detected 35 to 38 km (22 to 24 miles) from the Fukushima Daiichi nuclear power plant, portending that plutonium-239 contamination is severe long distances downwind. Np-239 quickly decays into Pu-239, which then has a 24,400 half-life, or, put another way, 240,000 to 480,000 year ultra-hazardous persistence.