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Inverse-square law and absorption of gamma or beta rays with the Geiger-Müller counter

Inverse-square law and absorption of gamma or beta rays with the Geiger-Müller counter

Item no.: P2524101

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Principle

The inverse square law of distance is demonstrated with the gamma radiation from a 60-Co preparation, the half-value thickness and absorption coefficient of various materials determined with the narrow beam system and the corresponding mass attenuation coefficient calculated.

Tasks

  1. To measure the impulse counting rate as a function of the distance between the source and the counter tube.
  2. To determine the half-value thickness d1/2 and the absorption coefficient of a number of materials by measuring the impulse counting rate as a function of the thickness of the irradiated material. Lead, iron, aluminium, concrete and Plexiglas are used as absorbers.
  3. To calculate the mass attenuation coefficient from the measured values.

What you can learn about

  • Radioactive radiation
  • β-decay
  • Conservation of parity
  • Antineutrino
  • g- quants
  • Half-value thickness
  • Absorption coefficient
  • Term diagram
  • Pair formation
  • Compton effect
  • Photoelectric effect
  • Conservation of angular momentum
  • Forbidden transition
  • Weak interaction
  • Dead time
Document     Filesize
p2524101e.pdf Experiment guide, English 383.41 KB

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