Catching cosmic ray muons

In my project, I constructed a particle detector in order to detect muons coming from cosmic rays. The detector was designed by MIT under the project called Cosmic Watch: Catch yourself a muon [1]. The assembly of the detector involved soldering various electronic components on the board circuits. In the end, I had a fully-assembled detector which was able to register events. While recording, the event rate was not constant and was not consistent with cosmic rays rates. Therefore, the detector needs further troubleshooting.