Half Life and how Japan dealt with it

What is half life?
The half-life of a radioactive element is the amount of time it takes for one half of the atoms of that substance to disintegrate into another nuclear form. These can range from mere fractions of a second, to many billions of years. Simply, half life is the process whereby the radioactive elements slowly "enters" our body and harms us, killing us slowly.

These are some elements
Ba-139 - 82.7 minutes
Br-82 - 35.30 hours
C-14 - 5730 years
Cr-51 - 27.704 days
I-125 - 60.14 days

So, despite knowing that it is harmful, Japan is still pumping water into the ocean and saying that the iodine in the ocean will "disappear"?

I feel that Japan should not do this as pumping the contaminated water into the ocean will not make the iodine go away. In fact, its just worsening the situation as the iodine in the ocean will travel to different parts of the world, and the whole whole will be affected as the iodine is being transmitted.

Citation/Bibliography
http://www.iem-inc.com/toolhalf.html