  Gamma radiation associated with radon decay exhibits variations in both time
of year and time of day. The annual oscillation has its maximum value in June,
suggestive of a galactic influence. Measurements made at midnight show strong
evidence of an influence of solar rotation, but measurements made at noon do
not. We find several pairs of oscillations with frequencies separated by 1
cycle per year that is suggestive of an influence of rotation that is oblique
with respect to the normal to the ecliptic. We suggest that beta decays may be
stimulated by neutrinos and that the decay products tend to travel in the same
direction as the neutrinos. We estimate the relevant cross section.
