Abstract
A new method for the determination of thorium in quantities of the order of 10—5 to 10—6 g is employed to complete the data necessary for the calculation of the age of geological material. The alpha-particle activity of thoron in a streaming gas is measured with a counter, a procedure which is shown to be superior to the usual ionization measurements on the thoron deposit. Simultaneously, the Pa/Ra ratio in common rocks can be determined.
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