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- W301890627 abstract "Research devoted to development of isotopic methods for dating manufactured items is described. Cured rubber tread formulations containing isotopes such as C/sup 14/, S/sup 35/, Cl/sup 36/, Ca/sup 45/, Sr/sup 89/ and Tc/ sup 99/ were used. Tagged products wer e also used to study perturbations from self-absorption in the material. Samples containing Cl/sup 36/, Sr/sup 89/, and Tc/sup 99/ were used. Results are tabulated and discussed. Similarly tagged product material samples were used to investigate the feasibility of measuring isotope ratio directly by means of internal liquid scintillation suspension counting. Most isotope pairs used in demonstrating the principle of this technique were pure beta emitters; however, equations were developed for an emitting pair in which the timer species generates safer radiation than does the reference standard. Utility pairs composed of mixed beta and gamma emitters was also investigated. Data on measured ages of product-free isotope mixtures compared with their actual ages are included. Analyses of data obtained during the quarter include estimation of the effects on computed ages of factors such as statistical errors, half life of timer in relation to age period, relative initial concentration of standard and timer, isotopic impurities, and decay of the reference standand. Amore » table of isotope pairs recommended for age periods of 2 weeks to 120 years is included. (For preceding period see AECU-4441.) (J.R.D.)« less" @default.
- W301890627 created "2016-06-24" @default.
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- W301890627 date "1960-10-31" @default.
- W301890627 modified "2023-09-24" @default.
- W301890627 title "ISOTOPIC METHOD FOR AGE DETERMINATION OF INDUSTRIAL PRODUCTS. Quarterly Progress Report for October-December 1959" @default.
- W301890627 hasPublicationYear "1960" @default.
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