His point has little to do with bananas and much to do with the danger of radiation and how it is commonly attributed to nuclear power plants rather than coal.

Here is an example of someone else making the same point:

http://www.ornl.gov/info/ornlreview/rev26-34/text/colmain.ht...

You are right about the facts. And perhaps that's a non-point on well-educated HN. But the general public seems to be under-appreciating the pervasiveness of natural radiation, and freaking out about any nuclear contraptions. In some countries you can't even import those glowing tritium keychains :-(