Comment on "Observation of annual modulation by $γ$ rays from ($α$,$γ$) reactions at the Soudan Underground Laboratory"

Tiwari {\it et al.}\ have identified an annual modulation of the $γ$-ray flux at the Soudan Underground Laboratory which is strongly correlated to the radon concentration. The $γ$-ray flux results from ($α$,$γ$) reactions which are induced by the $α$ activity of radon and its daughters. Unfortunately, the quantitative analysis of the $γ$-ray flux is based on unrealistic ($α$,$γ$) cross sections, and thus the calculated $γ$-ray fluxes are not reliable.

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