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

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.

Geiger-Mueller counter tube, type B, BNC cable 50 cm

Absorption plates for beta rays

Absorption material, lead

Absorption material, iron

Absorption material, aluminium

Absorption material, concrete

Base plate for radioactivity

Counter tube holder on fixating magnet

Source holder on fixing magnet

Plate holder on fix. magnet

Vernier calliper stainless steel 0-160 mm, 1/20

Radioactive sources, set

PHYWE Geiger-Müller Counter

  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.
  • 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

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Product number

P2524101

inverse-square-law-and-absorption

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