Image: Radon spectrum
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Description: Emission spectrum of w:radon, photographed by w:Ernest Rutherford in 1908. Numbers at the side are wavelengths. Middle spectrum is radon, outer two spectra are w:helium (added to calibrate the wavelengths).
Title: Radon spectrum
Credit: http://www.periodicvideos.com/videos/086.htm
Author: Ernest Rutherford
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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