Abstract
In the present study a new and relatively simple method has been developed to measure the ratio of thermally reduced track length to unaffected track length l s/ l i. The method consists of counting track densities on different parallel planes cut from a single apatite sample, instead of measuring track lengths of a single surface plane; thus the desired ratio of lengths can be derived from ratios of track densities only. This method has been applied to samples of Durango apatite, yielding an averaged ratio of l i/ l s =1.14±0.06. The result is in good agreement with values we obtained by other independent methods of 1.12±0.05 and 1.13 ±0.05, respectively. The present method, in addition, can also be used to determine extremely high fission track densities which otherwise would be too high for optical counting.
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