If you’re in Georgia (the state, not the country) then you have absolutely nothing to worry about regarding any radiation from Fukushima, unless by some chance you’re eating food imported from Japan. Even then the worries are minimal.
As to half-lives, the half-life of Cesium 137 is of most concern, being over 30 years. However, there is no significant concentration of this beyond a few miles around Fukushima. Iodine 131 was released in some quantity, but its half life is only eight days.
For the current situation, see the link below. It looks like things are well under control barring further natural disaster.
http://www.iaea.org/newscenter/news/tsunamiupdate01.html
We know we are bring overly cautious.
We know we are being overly cautious.