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Observation of atmospheric gamma-rays and electrons for calibrating the atmospheric neutrino ｆlux

We are calibrating our calculation (Honda et al., 1995) of neutrino ux by observing high energy photons and electrons in the atmosphere and comparing them with the calculation. So far we have performed observation at Mt. Norikura (2780 m a.s.l). A major balloon altitude observation is scheduled in the summer of 1999. Accelerator calibration is also planned in June. For these observation we use the upgraded BETS scintillating ber imaging calorimeter. We describe our strategy, detector and status of the project. Data analysis is in progress and will be presented at the conference.