How might an exoplanet have a highly radioactive atmosphere?

The exoplanet in question is Proxima Centauri b. How might the mid-to-upper-level atmosphere of that planet be dangerously radioactive and full of airborne nuclear reagents, without it being the doings of an intelligent species?

Edit. I am aware that Proxima b is subject to extremely powerful solar winds from its host star, which makes it unlikely to have an atmosphere. However, if it were to have an atmosphere, is it possible that the gases that make up that atmosphere could react with the protons, electrons, alpha particles, etc. that it's being constantly bombarded with to undergo nuclear reactions as a result?

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How might an exoplanet have a highly radioactive atmosphere?

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