Comment on 'Observation of annual modulation induced by gamma rays from (alpha, gamma) reactions at the Soudan Underground Laboratory'

摘要

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