ABSTRACT
Like most other fields of physical and chemical research which depend on the advance of authors knowledge of radioactivity and other nuclear processes, the matter of radioactive age determination has made tremendous strides in the last decade. Therefore it would seem desirable to briefly summarize the various radioactive methods that are presently recognized as having value in geologic age determination and to indicate their limitations. These are enumerated for each method followed by an estimate of the potential effective range, and finally the geologic conditions in which the particular method may be used. Uranium minerals might be useful in this method for very young rocks to the present but older minerals would certainly be severely shattered and a large fraction of their helium lost. A great potential advantage of this method in contrast to the preceding ones is that the accuracy of the age determination is independent of the age of the deposit.
