Zimmerman, B.
and Bergeron, D.
(2016),
(Mis)use of 133Ba as a calibration surrogate for 131I in clinical activity calibrators, Applied Radiation and Isotopes, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=918657
(Accessed October 8, 2025)
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(Mis)use of 133Ba as a calibration surrogate for 131I in clinical activity calibrators
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Abstract
Using NIST-calibrated solutions of 131Ba and 131I in the 5 mL NIST ampoule geometry, measurements were made in three NIST-maintained Capintec activity calibrators and the NIST Vinten 671 ionization chamber to evaluate the suitability of using 133Ba as a calibration surrogate for 131I. For the Capintec calibrators, the 133Ba response was a factor of about 3 times higher than that of the same amount of 131I. For the Vinten 671, the Ba-133 response was about 7 % higher than that of 131I. These results demonstrate that 133Ba is a poor surrogate for 131I. New calibration factors for these radionuclides in the ampoule geometry for the Vinten 671 and Capintec activity calibrators were also determined.Citation
Applied Radiation and Isotopes
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Journals
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Keywords
activity calibrators, barium-133, iodine-131, ionization chambers
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Created March 1, 2016, Updated February 19, 2017