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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?
Sure, the halflife of Po-218 is 3.04 minutes. So what? The atoms doing the traveling are Radon 222 and it's halflife is 3.8 days. Plenty of time to travel from one point and collect in another before it decays to Po-218 which then quickly decays to Po-214 (halflife 163 microseconds) then to Po-210 (halflife 138 days) to Pb-206 (stable). It isn't difficult to see that once the radon has collected and those 4 decays occur that a significant halo would be observed.

A faith that connot survive collision with the truth is not worth many regrets. -- Arthur C. Clarke