June, 11, 2007 Cosmic Ray measurements using HpGe Detector

two 30 minute long measurements were taken using the high purity Germanium detector

The Black histogram represents the rates observed WITHOUT the lead shielding plate and the Red cure is what happens when a 1" thick lead plate is placed on top of the Ge detector to shiled cosmics. The integrated rate changes from 9.5 to 5.1 million events/sec. Low energy events are clearly attenuated more. A peak at around 1.415 MeV is dimished as well and a new peak arrises at 1.450 MeV.