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We observed atmospheric gamma-rays around 10 GeV at balloon altitudes (15~25km) and at a mountain (2770 m a.s.l). The observed results were compared withMonte Carlo calculations to find that an interaction model (Lund Fritiof1.6)used in an old neutrino flux calculation was not good enough for describing theobserved values. In stead, we found that two other nuclear interaction models,Lund Fritiof7.02 and dpmjet3.03, gave much better agreement with theobservations. Our data will serve for examining nuclear interaction models andfor deriving a reliable absolute atmospheric neutrino flux in the GeV region.Comment: 9 pages 12 figure

Atmospheric gamma-ray observation with the BETS detector for calibrating atmospheric neutrino flux calculations