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Home > All Images > 1990 > September > 4 Sep 1990

Images Dated 4th September 1990

Choose from 8 pictures in our Images Dated 4th September 1990 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.


Geiger counter, for detecting radioactivity Featured 4 Sep 1990 Print

Geiger counter, for detecting radioactivity

Geiger counter, a device used for detecting radioactivity by it's ionising effect as it passes through a gas at low pressure (contained in the cylindrical tube). The charged particles so produced are counted mechanically and a reading is given on the dial or displayed audibly by a series of characteristic clicks. Here, the counter is registering the radiation emitted by a watch. Radium salts are used for the paint on luminous watch dials despite their being radioactive. Some of the counts registered are due to natural background radiation from cosmic rays and the decay of radio- isotopes in the soil

© DAVID PARKER/SCIENCE PHOTO LIBRARY