Gamma rays are streams of electro-magnetic waves. They are given off from elements such as radium, when they undergo a process known as radioactive decay.
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In 1899 the British Physicist Ernest Rutherford began a study of radioactivity. He found three types of radiation which he called alpha, beta and gamma rays. Alpha rays were stopped by a thin sheet of paper, beta rays could get through several millimetres of aluminium and gamma rays could pierce quite thick pieces of lead.
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Alpha rays travel up to 12,000 miles a second; beta rays from 80,000 to 180,000 miles a seco0nd, and gamma rays at 186,000 miles a second, the speed of light.
Gamma rays have proved very helpful in medicine and industry. These rays are also given off by radioactive isotopes.
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In 1899 the British Physicist Ernest Rutherford began a study of radioactivity. He found three types of radiation which he called alpha, beta and gamma rays. Alpha rays were stopped by a thin sheet of paper, beta rays could get through several millimetres of aluminium and gamma rays could pierce quite thick pieces of lead.
***
Alpha rays travel up to 12,000 miles a second; beta rays from 80,000 to 180,000 miles a seco0nd, and gamma rays at 186,000 miles a second, the speed of light.
Gamma rays have proved very helpful in medicine and industry. These rays are also given off by radioactive isotopes.
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