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
- To measure the impulse counting rate as a function of the distance between the source and the counter tube.
- 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.
- 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