Info about radioactivity 2

I just add some more info about the radioactivity. I have got these data from my friend.
Here is the data of Ibaraki (茨城) that locates neighbor of Fukushima.
http://www.mext.go.jp/component/a_menu/other/detail/__icsFiles/afieldfile/2011/03/18/1303724_10.pdf

Data of Shinjuku, Tokyo(新宿)

The vertical line shows numerical data of radio activity.              
 Its units is "micro Sievert." Do NOT mix up with milli Sievert. 
The horizontal line shows the date.
So as "2011.3.15" means March 15, 2011.

Just have a look of the data.

After March 16, it stays between green line as you see. It surely says the numerical value stays in the safe zone.

I surely understand that we still have to be careful though. Right now, we are NOT in such serious condition.

Here are some additional explanation that are form the guy who gave me these data.

For those who visit here, please allow me to put a comment that those horizontal green lines show the provable distribution of usual radioactivity level, based on statistics obtained from the previous monitoring.