The reference that Darrell provided exposes itself as misleading clap trap designed to spread irrational fear in the following sentence:
"Sadly, it is the gift that keeps on giving... gamma rays."
It might sound like I am picking nits to some people who do not understand how radioactive materials behave, but the 2,200 mSv/hr dose rate that is also reported in the scariest possible terms is nearly 100% BETA radiation, not gamma rays.
That measurement is essentially what we call an "on contact" reading; it almost completely disappears when the probe is moved just 50 cm away from the concentrated source. If a reasonably thick sheet of paper is put between the source and the probe, the reading also falls off dramatically. Clothing is normally considered all the protection that workers need to ensure that they are not harmed by a beta emitter.
The GAMMA dose rate from that same source - the one that reads 2,200 mSv/hr - is just 1.5 mSv/hr. It is a "hot spot", but it is not nearly as dangerous as financial publications like ZeroHedge, that want to make money by spreading fear of nuclear energy.
Here are a few example plays that might be peaking ZeroHedge's interest. Oil & gas companies have been making many tens of billions per year selling fuel to Japan to replace the output of their shuttered nuclear plants and contracting companies are chomping at the bit to be in on the many billions that some want Tepco to spend to attempt to stop water from flowing from the mountains into the oceans.