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17 April 2014 12:48 pm ,
Vol. 344 ,
Using the two high-quality genomes that exist for Neandertals and Denisovans, researchers find clues to gene activity...
A new report from the Intergovernmental Panel on Climate Change (IPCC) concludes that humanity has done little to slow...
Astronomers have discovered an Earth-sized planet in the habitable zone of a red dwarf—a star cooler than the sun—500...
Three years ago, Jennifer Francis of Rutgers University proposed that a warming Arctic was altering the behavior of the...
Officials last week revealed that the U.S. contribution to ITER could cost $3.9 billion by 2034—roughly four times the...
An experimental hepatitis B drug that looked safe in animal trials tragically killed five of 15 patients in 1993. Now,...
- 17 April 2014 12:48 pm , Vol. 344 , #6181
- 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).]