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Abstract:
Intensities of ultrahigh energy γ-rays observed in Chinese emulsion chamber experi ments at several altitudes, including Yunnan Station (3200 m), Mt. Kambala (5500 m), and the foot of Mt. Qomolangma (Everest, 6500m) are summarized. An intensity altitude relation and in particular, the attenuation length of γ-rays at the foot of Mt. Qomolangma are presented.
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