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Gamma Rays

 Overview

Spectograph showing various ranges of radiation including gamma rays.
These are the most energetic electromagnetic radiations of wavelength less than 0.1 Å (or 0.01 nm)

Sources

They are obtained in radioactive emissions, when the nuclei of radioactive atoms pass from the excited state to the ground state. They are also present in cosmic radiations.

Properties

Like X-rays, they cause florescence when they strike the fluorescent materials such as zinc Sulphide. They can easily penetrate through thick metallic sheets (eg. 30 cm thick iron sheet). Gamma radiations easily pa through human body and cause immense biological damage.

Uses

They are used in medical science to kill cancer cells (i.e. radio therapy) AM in industry to check welding.
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