Geiger counters have many important uses with respect to the detection and measurement of alpha, beta and gamma radiation. Uranium-238 with traces of uranium-235 is mined for refinement use as a fuel. Plutoium-239 and thorium-232 are also used as nuclear fuels. The use of commercial radioisotopes is wide-spread. Sources of alpha particles or helium nuclei include polonium-210 and uranium-238. Sources of beta particles or fast electrons include strontium-90, thallium-204, carbon-14 and hydrogen-3 or tritium. Sources of energetic photons of gamma include barium-133, cadmium-109, cobalt-57, cobalt-60, europium-152, manganese-54, sodium-22, zinc-65 and technetium-99. Cesium-137 emits gamma and beta. Americium-241emits gamma and alpha.
Non-nuclear Industrial Uses
Radiation and Geiger counters are used to measure the strength of welds, the wear and corrosion of metals, and in the analysis of minerals and fuels. Gamma rays from Cobalt-60 are used to kill bacteria in foods and halt cellular processes that would lead to sprouting. This process must be closely monitored.
Nuclear Industry Uses
Geiger counters are used for detecting leakage of radioactive materials from containers during storage and transportation, detecting radioactive contamination of other objects and materials, detecting leakage of radiation from pipes and containment vessels in nuclear power plants. Geiger counters are used to locate and evaluate deposits of uranium ores.
Environmental Uses
Geiger counters are used to monitor radiation levels in the atmosphere, ground water, lakes, rivers and oceans. Radiation is monitored in landfills and dumps, nuclear waste repositories, warehouses and transport areas. Radioisotopes can help monitor pollutants and to measure the movement of surface waters as well as the runoff of rain water. Geiger counters are used by first responders to check for radiation at a disaster site or the site of a terrorist attack.
Home Uses
Radon gas is a significant danger in homes and should be monitored. Smoke detectors contain radioactive materials that may be released if the detectors are damaged. Radioactive particles and gases may invade the home from nuclear accidents and can be tested for with Geiger counters.
Medical Uses
A number of different isotopes are utilized in modern medicine that must be carefully handled and should be monitored by Geiger counters. Some medical equipment emits radiation such as X-rays. Radioisotopes injected into patients are taken up by specific tissues and used for imaging or for treatment of cancers.
Laboratory Uses
Geiger counters are useful in modern science for monitoring of radioisotopes in such applications as dating the age of rocks, and biological materials and artifacts, the analyzing the structures of materials such as proteins, tracing biological processes in plants and animals,
There are a variety of different types of Geiger counters utilized for these different purposes. There are other types of radiation detection technologies but Geiger counters are the most common.
