Detecting Cosmic RaysDetecting Cosmic RaysAn inexpensive portable detectorAn inexpensive portable detector

By: Danny FrankeBy: Danny Franke

Quarknet 2004Quarknet 2004

LBNL DetectorLBNL Detector

http://www.lbl.gov/abc/cosmichttp://www.lbl.gov/abc/cosmic//

ScintillatorsScintillators

Scintillators are Scintillators are materials which emit materials which emit light when they interact light when they interact with charged particles.with charged particles.

Usually a type of plastic Usually a type of plastic that is doped with small that is doped with small amounts of aromatic amounts of aromatic hydrocarbons. hydrocarbons. (Polyvinyltoluene)(Polyvinyltoluene)

Photomultiplier TubesPhotomultiplier Tubes

Photon DetectorsPhoton Detectors Operate on photoelectric Operate on photoelectric

effecteffect Amplification is obtained Amplification is obtained

by a sequence high by a sequence high voltages applied across voltages applied across dynodesdynodes

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LBL ElectronicsLBL Electronics