A new NIST primary standardization of F-18

作者：Fitzgerald R^*; Zimmerman B E; Bergeron D E; Cessna J C; Pibida L; Moreira D S

来源：Applied Radiation and Isotopes, 2014, 85: 77-84.

DOI：10.1016/j.apradiso.2013.11.116

• Fluorine-18
• F-18
• Anticoincidence
• TDCR
• CIEMAT/NIST
• Dose calibrator

A new primary standardization of F-18 by NIST is reported. The standard is based on live-timed beta-gamma anticoincidence counting with confirmatory measurements by three other methods: (i) liquid scintillation (LS) counting using CIEMAT/NIST H-3 efficiency tracing; (ii) triple-to-double coincidence ratio (TDCR) counting; and (iii) NaI integral counting and HPGe gamma-ray spectrometry. The results are reported as calibration factors for NIST-maintained ionization chambers (including some "dose calibrators"). The LS-based methods reveal evidence for cocktail instability for one LS cocktail. Using an ionization chamber to link this work with previous NIST results, the new value differs from the previous reports by about 4%, but appears to be in good agreement with the key comparison reference value (KCRV) of 2005. Published by Elsevier Ltd.

• 出版日期2014-2