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Gas Scintillation

LEVEL 3 LABORATORY

High Energy Physics

Alpha Particle-Induced Gas Scintillation

Objectives of the Project

  • Measure the emission of light produced in air, and other gases, by the transmission of alpha particles through the gases.
  • Measure the UV/visible spectra of the emitted light.


Apparatus

  • Photomultiplier Tube.
  • Monochrometer.
  • Precision Linear Stage
  • Vacuum box for source and light detector with vacuum pump and pressure gauges.

Experimental Procedure

  1. Study the properties of the PhotoMultiplier Tube (PMT). How does it work?
  2. Plot the counting rate of the PMT at atmospheric pressure as a function of source – separation and at constant separations as a function of pressure.
  3. Measure the UV/Visible spectra of light emission from the gases.

Safety and Precautions

Remember that Am241 is both an alpha and a gamma emitter.
The technician will insert the source in the apparatus. Subsequently, DO NOT OPEN the vacuum box without prior consultation with the laboratory supervisor.

Do not expose the PMT to ambient light whilst the detector is switched on.
 
References

  • Siegbahn, K.: Alpha, Beta and Gamma Spectroscopy.
  • Knoll, G.F.: Radiation Detection and Measurement.
  • Leo, W.R.: Techniques for Nuclear and Particle Physics Experiments
  • Useful statistics

External links