NEWS European C o n f e r e n c e on Electron Microscopy—1964 The Third European Regional Conference on Electron Microscopy will be held in Prague, Czechoslovakia, August 26 to September 3, 1964. This meeting is being organized by the National Committee for Electron Microscopy of the Czechoslovak Academy of Science under the auspices of the International Federation of Societies for Electron Microscopy. The conference will deal with physics and the construction of electron microscopes, as well as with biological, medical, chemical, metallurgical, and technological subjects connected with electron microscopy. Related fields such as electron diffraction and interferometry, ion emission and x-ray microscopy will also be covered. Contributed papers should not be longer than 10 minutes; papers will be read in four or five parallel sessions. The practice adopted at the Philadelphia Congress in 1962 of preeongress publication of the conference papers will be follewed. The meeting will include an exhibition of microscopes, photographs, and related equipment. All correspondence should be sent to 3rd European Regional Conference on Electron Microscopy, Prague 1964, Organizing Committee, Albertov 4, Prague 2, Czechoslovakia. Chromatography
Courses
Analytical Engineering Laboratories, Inc., will hold courses on gas and thin layer chromatography at Stratford, Conn. The gas chromatography course will be held October 7 to 9 and the tuition is $125. The thin layer chromatography course will meet October 10 and 11, and the tuition is $100. Combined tuition is $200. Applications will be accepted until September 15. Write to Analabs, P. O. Box 5215, Hamden 18, Conn.
Polyatomic
Radicals
The Society of Physical Chemists of France will hold its 40th annual meeting at Bordeaux from May 25 to 29, 1964. The subject of this meeting is the structure of polyatomic radicals. Research specialists in the various techniques used in structure edification of radicals engendered by the excitation or rupture of molecules will present papers on their work. More information is available from Prof. Guy Emschwiller, Société de Chimie Physique, 10 rue Vauquelin, Paris 5°, France.
PINPOINT TRACE ELEMENT
DETERMINATIONS BY N E U T R O N
ACTIVATION ANALYSIS • Analyses of materials for over 65 elements in the parts-per-million to parts-per-billion range are now available on a routine basis with the neutron activation analysis service of Union Carbide's Nuclear Division. • An experienced staff performs specific, sensitive, accurate analyses using Union Carbide's 5-megawatt research reactor. Typical of the sensitivities possible at thermal neutron fluxes of 3 x 10' 3 n / c m 2 / s e c , are the values shown below for some of the elements: ELEMENT Sodium Magnesium Aluminum Silicon Phosphorus Sulfur Chlorine Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium
PPM* ,02 .06 .0009 .5 4. 20. .004 .2 .2 .0003 .05 .00008 1. .0002 .00003 .2 .005 .006 .01 .03 .008 .0003
ELEMENT
PPM*
Dromine .0002 Rubidium .02 Strontium .08 Yttrium .09 Zirconium 2. Columbium .0006 Molybdenum .04 Ruthenium .08 Rhodium .000005 Palladium .01 Silver .00003 Cadmium .2 Indium .00002 Tin .07 Antimony .007 Tellurium .02 Iodine .0004 Cesium .03 Barium .02 Lanthanum .002 Cerium .9 Praseodymium .005 Neodymium .03
ELEMENT
PPM*
Samarium F.uropium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury Thallium Thorium Uranium
.004 .00004 .006 .01 .000005 .002 .003 .08 .01 .0004 .03 .06 .009 .002 .2 .000006 .009 .002 .05 .02 .0004 .002
* Parts-per-million: when a one-gram test sample is irradiated in a neutron flux (n/cma/sec.) of 3 X 10'3 fora time period of 20 minutes.
• Liquid, gaseous, and solid sample materials are analyzed with minimum interference from major matrix elements. • Many analyses can be completed without chemical processing. When chemical separations are necessary, in many cases rapid separation procedures are available to complete the analysis. FOR MORE INFORMATION concerning Union Carbide's neutron activation analysis program write t o : Nuclear Operations, Union Carbide Nuclear Research Center, Box 324, Tuxedo, New York.
UNION CARBIDE
NUCLEAR DIVISION
Circle No. 209 on Readers' Service Card
VOL. 35, NO. 10, SEPTEMBER 1903
·
75 A
