The study of the correlation between ($\alpha $, $\gamma )$ induced events with respect to Radon annual modulation.

We observed ($\alpha $, $\gamma )$ reaction that~generates high energy gammas in Soudan mine with a~12 liter liquid scintillation detector. With~a model established to describe the correlation between ($\alpha $, $\gamma )$ induced events with radon annual modulation, we demonstrate~that ($\alpha $, $\gamma )$ induced events are highly~correlated~with the radon modulation.~ These~($\alpha $, $\gamma )$~induced events can be potential background events for rare event physics.