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Po-218 decay halos ALWAYS occur along cracks in the crystal structure of the quartz/granite. Po-218 is a decay product of radon which is itself a decay product of uranium. The uranium decays to radon and the radon gas travels along the crack and collects at another point. Then it decays to Po-218 causing the Polonium Halo effect.
Not so fast! You're confusing fantasy with observation. You repeat the fantasy imagined to explain the radiohalos away, but it can never work.

Not until you incorporate a mechanism which will prevent decay while the polonium is traveling through the crack. Otherwise the result of this scenario - which isn't observed - would be a tube shaped halo. Only spheres are found. You'll also need another mechanism to keep the polonium from exiting prior to decay. And you'll need your mechanism to operate quickly. Did you happen to notice the halflife you're dealing with?

Dark Matter + Dark Energy = Dark Truth

"We find that such evidence demonstrates that the ID argument is dependent upon setting a scientifically unreasonable burden of proof for the theory of evolution." - Judge Jones Kitzmiller case
http://www.talkreason.org/articles/Falsify.cfm

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