期刊
APPLIED RADIATION AND ISOTOPES
卷 190, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.apradiso.2022.110507
关键词
Half-life; Ionization chamber; Gamma -spectrometry; Nuclear data; 44Sc; 44mSc
The half-lives of 44Sc and 44mSc were measured using various measurement systems, and their values were found to be 4.042(7) h and 58.7(3) h, respectively. These results confirm the deviation from the recommended values and provide valuable information for the production and use of these isotopes.
The half-lives of 44Sc and 44mSc were measured by following their decay rate using several measurement systems: two ionization chambers and three gamma-spectrometry detectors with digital and/or analogue electronics. For 44Sc, the result was the combination of seven half-life values giving a result of 4.042(7) h, which agrees with the last reported value of 4.042(3) h and confirms the near to 2% deviation from the recommended half-life of 3.97(4) h. Scandium-44 is present as an impurity in the production of 44Sc by cyclotron proton irradiation. Its half-life was determined by measurements performed a few days after End of Bomardment (EoB), so that the 44Sc decayed down to a negligible level. Seven measurements were combined to obtain an average of 58.7(3) h, which is in agreement with the recommended value of 58.6(1) h.
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