Function and Applications
This alpha-particle detector is for detecting alpha radiation
and determining its energy.
If it is not necessary to determine the energy of the detected
particles, the alpha detector can also be used as a counter tube to
detect beta radiation.
When an alpha particle hits the detector, it interacts with the
material inside the depletion layer and gives up all its kinetic
energy. In the course of this process, a number of free charge
carriers will be generated which is proportional to the primary
kinetic energy of the alpha particle. The proportionality between
the kinetic energy and the quantity of charge carriers
produced is applicable for alpha particles because they do not
penetrate very far into the material. This is not the case for beta
particles, since they penetrate into the material beyond the
thickness of the depletion layer, too far for them to give up all
their energy there. For beta particles, therefore, the detector can
only be used to detect the entry of a particle and cannot establish
its kinetic energy.
Equipment and Technical Data
- Sensitive surface: 15 mm2.
- Energy resolution for alpha particles at 5.486 MeV: 30
- Required biasing: - 8... -38 V.
- Detector dimensions (length x diameter): 51 mm x 22 mm.
- Screen dimensions (length x diameter): 70 mm x 45 mm.
- Weight of detector: 55 g approx.
- Weight of screen: 35 g approx.
- The detector is supplied with a protective cap and a screen to
keep out visible light.
- Charge-sensitive pre-amp (09100.10).
- Multi-channel analyser (13726.99) or pulse amplitude
- BNC cable.