کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1877598 1532112 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A new NIST primary standardization of 18F
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم تشعشع
پیش نمایش صفحه اول مقاله
A new NIST primary standardization of 18F
چکیده انگلیسی
A new primary standardization of 18F 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 3H efficiency tracing; (ii) triple-to-double coincidence ratio (TDCR) counting; and (iii) NaI integral counting and HPGe γ-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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Radiation and Isotopes - Volume 85, February 2014, Pages 77-84
نویسندگان
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