REMARKS ON RECONSTRUCTION OF DEFECTS DISTRIBUTION BY POSITRON LIFETIME MEASUREMENTS

It is well known that the positron trapping rate obtained from positro n lifetime measurements depends upon defect concentrations and trappin g efficiency. If a distribution of open volume defects exists, a distr ibution of trapping efficiency also could be present. As an example, t he calculation of trapping efficiency as a function of radius of defec ts in Al is presented. The correct explanation of defect size distribu tion obtained by positron lifetime measurements needs to introduce som e additional assumptions about trapping efficiency.