Variation of the intensity of high-energy cosmic ray hadrons with altitude

Using small Pb emulsion chambers placed at a mountaineering camp site on Mt. Qomolangma [Mt. Everest] at 6500 m altitude above sea level, the intensity of high-energy cosmic ray hadrons is determined. Combining with data obtained at Mt Kanbala (5500 m above sea level) and the Yunnan Cosmic Ray Observatory (3200 m above sea level), variations of the intensity of high-energy cosmic ray hadrons with altitude are obtained