Abstract
High-altitude balloon flight experiments were conducted at Poona 9° N. (mag.) to measure cosmic-ray intensity with quadruple-coincidence counter telescopes with 10 cm. of lead between the counters, using the radiosonde technique. Heights of 60,000 ft. (100mb.) were reached. It is concluded that the intensity of cosmic radiation penetrating 10 cm. of lead absorber increases monotonically with decreasing atmospheric pressure.
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