What are the dangers of using fusion rocket engines in atmosphere?

As far as I understand, when you fuse deuterium (H-2) and tritium (h-3), you get a helium atom and a spare neutron. Basically alpha-rays? Now alpha rays are easily blocked by matter. You can block alpha rays with just a sheet of paper.

Does this mean that you can safely use a deuterium-tritium fusion engine in atmosphere? Not on the ground obviously, but somewhat higher in the sky.

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What are the dangers of using fusion rocket engines in atmosphere?

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