Abstract
A new method to measure alpha activity of long-lived radioisotopes is reported. The method consists basically in using CR-39 track detectors in close contact with thick samples of the radioelement to be investigated. Accordingly, a long-term exposure experiment (up to 2 y) has been performed in the Gran-Sasso Underground Laboratory (INFN-LNGS, Italy), in which metallic sheets of natural platinum have been used to measure alpha activity of 190Pt isotope. The half-life of 190Pt has been obtained as (3.2 ± 0.1) × 10 11y, in good agreement with two recent theoretical half-life predictions.
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