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Earlier I said
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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?
The polonium doesn't travel through the crack, the radon gas does and collects in the location and then decays to polonium...which decays...and decays...etc

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... Gases flow. A gas flowing through a crack isn't going to stop at a destination and decay when you wish. Some will decay on the way, some - most - will pass through & out the other side of the "collection point". There must be an exit, or the gas won't flow in to begin with. You need a valve & you need to time it somehow & you need to prevent decay everywhere except at the selected location.

Since there's no known way to prevent decay, gas flowing through the system must decay the entire time and the path must show as a tube around the path. Until your gurus concoct a way to prevent undesired decay, their fantasy is a joke.

You, too, have to find a way to "prevent undesired decay". Since the uranium is there and the polonium is there then the radon must be there. The half lives of these elements, radon and polonium, is short enough for the decay to be continuing from the time of creation (6000 years ago?). Where are the "tubes" of radioactivity damage that you say must exist? Perhaps Robert Gentry's explanation is not as airtight as you first thought.

BTW: Your pictures don't "demonstrate" anything except the existence of halos. I did note that they are all on fault lines within crystals. Why didn't God put some of these polonium pieces in the crystal at locations with no cracks? There are halos at places with no cracks but those always show signs of uranium decay or still have uranium in them along with the daughter products of polonium decay.

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