I did give consideration to it. I was stating that there are different levels of radiation and there are different guidelines for amount of levels that people can safely be exposed to. The guidelines are based from the records and data that has been kept by different people in the different areas that were exposed to different levels of radiation. The bulk of those records came from Japan because they had before and after records of the atomic bombs.

With the initial comment I was going add the above to it but got distracted and posted what I had. I also was going to include that's great that nature is coming back to those areas but I don't see anything about how much radiation is present. Without some measurement or data it's hard to gauge how safe it is. You can measure how much radiation is being released. I use to work with moisture density gauges that have two radioactive sources. Companies that utilizes the gauges are required to measure the radiation levels in their buildings, the storage area, surrounding offices and sometimes employees have to wear a badge that indicates how much radiation is be released. I think in year I could not exceed 3rem because the general population is exposed to 5rem a year (it might be rads, I can't recall off the top of my head). If I got to 3, I no longer had to use the gauge for the remainder of the year but I think the highest most people get is 1.5 or 2 while using the gauges. You would literally have to take the beta radiation source out and play with it to do any damage.

I apologize that I didn't finish my initial comment.