LITERATURA
1. D uc kw orth H. E. - Mass Spectroscopy.
Cambrlfdge University Press, 1~.
2. E w aId a, OH i n ten b erg e r a - Methoden
,UDd Anwencioogen der MalSSeru;pektraskopie. Ver-lag Chemie. Weinheim 1953.
3. Hess D . . C., Brown H., Inghram M. G., Pat t e r son G. - Measurement of trace quan-tities of uranium ood lead in minerals. Mass
Spec-SUMMARY
The author dascr.ibes mass-spectrometer methods used for age determination of rocks !by means of mass-spectrmneter. This is an mstrument wor·king on the basis of seleCtion of ions havling various mass in a uniform m8lllllletic :f.ield. When dete.rmimng the age of rooks one uses nl¥fmral radioactivity
at.
some ele-ments that are <!OIIlStitue'Il'ts ·of the eBrlth'5 crust rocks. The :a.rli.cle contains a deSICription of severail. 'methods, a. o. thorium-lead, uranium-lead, potassimn-t!alcium, potassium-ar.gon .and rwbidium-slll'ontium. methods.·troscopy in Physies Researeh, U. S. Nat. Bur. Stand. Clr.cular 522, 1953.
4. lzotopy wgieoiogii. Izdiatielstwo Inostrannoj Li-teraJtury. Mookwa 1954.
5. Rankama K .. - Izotope Geology. Pergamon Press. Landan 1954.
6. R u s s e I R. D. - The Mass Spectrome:ter as a Geological Instrument. Advances in Mass Spec-tr{)IDetry. LOllldon 1959.
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