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초록· 키워드
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In this study, we employed the semi-empirical formulae proposed by Viola-Seaborg, Royer, and Poenaru to estimate the α-decay half-lives of the radioactive isotopes in the <sup>235,238</sup>U chains because they are important for alpha analysis and radioprotection. We found a large uncertainty of about two orders of magnitude, in the experimental data for the half-lives, as evaluated by using each model. The results showed that the current formulae are insufficient for isotopes that undergo a multi-decay mode or α-decay probability less than 1.5%. The relations between the estimated half- lives and the experimental data in NuDat Database were deduced as linear functions to improve the validity of the semi-empirical models. The large radioactivity uncertainty due to the half-lives cal culated by using the three models should be a concerned for the analysis of the radioactive isotopes using alpha spectrometers. On the other hand, an approach for estimating sample sizes based on the α-decay half-life in concentration analyses using alpha analysts is proposed for measurements
of largely uncertain or unknown half-life isotopes.
of largely uncertain or unknown half-life isotopes.
목차
I. INTRODUCTION
II. EVALUATION METHOD
III. RESULTS AND DISCUSSION
IV. CONCLUSION
REFERENCES
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