M. SOROIU, M. CEREI, M. ONCESCU, A. DANIS and C. MANTESCU
The Institute for Atomic Physics of the Academy of the Romanian People's Republic,
Bucharest
After the general principle of the radioactive methods used to determine
the absolute geologic time is briefly shown, the principle of the method for
determining radiogenic argon by using activation analysis is expounded.
The authors describe in detail the working stages of the method for determining
radiogenic argon by activation in the variant elaborated at the Bucharest Institute
of Atomic Physics: preparation of the sample vial, of the standard vial, introduction
of the radioactive argon in Geiger-Müller counters and measurement of
its activity.
The checks to which the method was subjected are shown: measuring the activity
of blank samples, determining known quantities of argon and comparing the age
determinations obtained, on the same samples, by the method described in this
paper and by the classic determination methods of radiogenic argon.
The results of all these checks allow the conclusion to be drawn that the method
elaborated at the Institute for Atomic Physics for determining radiogenic argon
is correct and can be applied to the series determination of absolute geologic
ages.