I Measured cosmic rays at different altitudes for my experiment

Vancouver
78m altitude 300 decays per hour
(N 49¾ W 123¾)

Whistler
679m altitude 450 decays per hour
(N 50¾ W 122¾)
1837m altitude 590 decays per hour

These measurements were done at Vancouver and Whistler, and used a Geiger-counter with detector for alpha and beta rays. The detector was pointed upward for all measurements. There were more cosmic rays at high attitude because there is less atmosphere. Actually there should be a big difference, but since they are moving nearly at the speed of light, time goes slower and this means they can travel farther in their lifetime.