In this paper the fission track method is used to determine the decay constant for spontaneous fission of
238U. The decay constant to be
λ
∫=(7.0±0.3)×10
-17(y
-1).
On the other hand, for the closs checking of fission track ages with the other ages, the same sample used for the dating by the other methods were used. From the results, it may be concluded that 6.85×10
-17(y
-1) (Fleischer and Price, 1964) is the probable apparent decay constant of spontaneous fission of
238U for geochronology within experimental error.
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