ISSN:
1476-4687
Source:
Nature Archives 1869 - 2009
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
Notes:
[Auszug] The electron gun incorporates a lanthanum hexaboride thermionic cathode, in the indirectly-heated rod configura tion9'10. For operation with a brightness 10 times greater than is normally obtained from a tungsten filament the cathode lifetime is regularly more than 100 h. Such brightness allows ...
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1038/281049a0