Difference between revisions 3767608 and 3930986 on simplewiki

{{for|other uses|Gamma (disambiguation)}}
'''Gamma rays''' (γ-rays) are [[electromagnetic]] waves with the smallest [[wavelength]]s in the [[electromagnetic spectrum]].<ref>The electromagnetic spectrum is made of many types of waves that are like light, but you can not see all of them.</ref> They were discovered in 1900 by [[Paul Villard]], and named in 1903 by [[Ernest Rutherford]].

Gamma rays are produced by some types of radioactive [[atom]]s.  Gamma rays are like [[x-rays]]. Both gamma rays and x-rays are [[photons]] with very high energies. Gamma rays are also a type of [[radiation]]. Gamma rays can travel through thick materials.  

[[Cobalt]]-60 and [[potassium]]-40 are two [[isotopes]] that emit gamma rays. Cobalt-60 is created in accelerators and is used in hospitals. Potassium-40 occurs naturally. Small amounts of potassium-40 are in all plants and animals. Gamma rays from potassium-40 each have an energy of 1460 thousand [[electron volts]] (keV). 

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