Angular Dependence Study of the Cosmic Ray Flux at 900 Meters Above Sea Level

？？In this study, the zenith angle distribution of the ground level cosmic ray flux have been measured at 900 meters above the sea level by using the developed prototype detector. The mea- surements have been done in Experimental Particle Physics Laboratory, Department of Physics, AIBU Bolu. The method used to carry out the experiment is by using simultaneous particle hits on two scintillator boxes that are arranged in tower mode then counts will accumulate in the scin- tillator counter boxes. This detector prototype provides a simpler, cheaper and suitable alternative to the common cosmic ray detectors for the detection of particles at ground level. The orientation of module is in the south-east direction. The fluxes and rates were measured for different zenith angles between 0o and 90o. The attenuation effect of the architectural components on the mea- sured cosmic ray flux was carried out by using GEANT4 simulation program and this effect was taken into account in the given results