How to disable the radiotion of Nuclear Reactor?

I created my world one year ago. At that time there was no lava/oil spring generated in it. I explored it wickedly so now I cannot use any infinite source to get power. I choosed Nuclear Reactor because it was easy to maintain. I had considered about the radiotion and built a individual building to hold it. But 4x Pu-241 Bars diffuse its radiotion to down to 2 chunks away. So I created a Dead Zone of 64x64x64 Sphere, damn it.

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