Introduction to in-situ techniques for radiological characterization of sites

2.10 Radiation detection principles


Radiation is detected by measuring (with an instrument) some effect produced in a given material/device (detector). Any material which shows a measurable change or response effect when radiation interacts with it can be used as a radiation detector material. As a radiation detector material can be used any material which shows a measurable change or response effect in interactions with radiation.

The more commonly used effects used for detecting radiation are summarized below:

Effect Type of Instrument Detector Material
Electrical
  • Ionizing Chamber
  • Proportional Counter
  • GM Tube
  • Solid State Detector
  • Gas
  • Gas
  • Gas
  • Semiconductor
Chemical
  • Film
  • Chemical Dosimeter
  • Photographic Emulsion
  • Solid or Liquid
Light
  • Scintillation counter
  • Crystal or Liquid
Thermo-luminescense
  • Thermo-luminescense dosimeter
  • Crystal
Heat
  • Calorimeter
  • Solid or Liquid

The more often used detectors for in-situ measurements will be described in Chapter 4.