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Year Description

1947
Development of commercial instruments for x-ray photometry in chemical analysis, for example, of tetraethyllead in gasoline.

1947
x-ray microscope devised by Kirkpatrick with reflection of grazing beams from spherical and elleptical mirrors.

1948
First Congress of International Union of Crystallography, Harvard University.

1948
X-ray microanalyzer designed, operating on principle of electron microscope with x-rays liberating photoelectrons from specimen, which are then magnetically focused.

1949
Electronic amplification of fluoroscopic images and reproduction on kinescopes Wireless transmission of radiographs.

1949
Successful microwave linear accelerator of traveling-wave type for 3- to 20-MeV x-rays.

1949
Mesons were produced from carbon by x-rays generated in a 355-MeV synchrotron at the University of California and in 1950 from the 350-MeV betatron at the University of Illinois.

1950
Increasing evidence of therapeutic value of 20-MeV x-rays.

1950
Successful mass chest radiography of whole populations in Minneapolis, Minnesota, Washington DC, and elsewhere.

1950
Discovery of chemical protection of tissues against ionizing radiations by injection of compounds to provide excess -SH (thiol) groups; renewed intensive effort to develop dosimeters, chemical, ionization, and biological.

1950
First use of cadmium sulfide cyrstals to detect x-rays of self-amplification 107-fold of photoconducting currents.

1951
Fiftieth anniversary of Nobel prize.

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