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10 April 2014 11:44 am ,
Vol. 344 ,
The Pyrenean ibex, an impressive mountain goat that lived in the central Pyrenees in Spain, went extinct in 2000. But a...
Tight budgets are forcing NASA to consider turning off one or more planetary science projects that have completed their...
Ebola is not a stranger to West Africa—an outbreak in the 1990s killed chimpanzees and sickened one researcher. But the...
In an as-yet-unpublished report, an international panel of geoscientists has concluded that a pair of deadly...
Tropical disease experts tried and failed before to eradicate yaws, a rare disfiguring disease of poor countries. Now,...
Since 2002, researchers have reported that agricultural communities in the hot and humid Pacific Coast of Central...
Balkan endemic kidney disease surfaced in the 1950s and for decades defied attempts to finger the cause. It occurred...
- 10 April 2014 11:44 am , Vol. 344 , #6180
- About Us
30 September 1998 7:00 pm
Today is the birthday of Hans Geiger, born in 1882, a German physicist known for the techniques he developed for detecting and counting charged particles. Geiger investigated the charge and nature of alpha particles and devised techniques for counting them. In 1925 Geiger and his colleague Walther Muller came up with a device, which was designed to be compact and portable and to measure alpha, beta, and other types of radiation. By 1928 the Geiger-Muller counter was being produced and used in radiation research labs. After noting that counters in separate rooms periodically picked up simultaneous bursts of radiation--the first detection of cosmic ray showers--Geiger became interested in studying cosmic radiation. In 1937 he and his colleague Otto Zeiller arrayed nine counters in a circle to determine the angular distribution of a cosmic ray shower.
[Source: Charles Coulston Gillespie, Ed., Dictionary of Scientific Biography (Charles Scribner's Sons, New York, 1973).]