Fukushima disaster

[Did44]

Hello,

Please check for errors (grammar, style) in this sentence I've translated from my language to English :

For the first time since the Fukushima nuclear plant disaster, a small quantity of plutonium has been detected in several ereas of the north-east Japan far away from the plant compound, announced the Japanese government last Friday, September 30, adding it would be useless worrying about these tiny quantities of radioactive plutonium.


Thanks.

[5jj]

For the first time since the Fukushima nuclear plant disaster, a small quantity of plutonium has been detected in several e areas of thenorth-east Japan, far (away) from the plant compound, announced the Japanese government announced last Friday, September 30, adding it would be useless that there was no need to worrying about these tiny quantities of radioactive plutonium.