کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8949013 1645696 2018 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Measurements of thorium and uranium daughters in radioenvironmental samples using γγ-coincidence spectrometry
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم تشعشع
پیش نمایش صفحه اول مقاله
Measurements of thorium and uranium daughters in radioenvironmental samples using γγ-coincidence spectrometry
چکیده انگلیسی
We present the performance of a γγ-coincidence spectrometer for measuring the activities of thorium and uranium daughters in environmental samples. The spectrometer consists of two NaI(Tl) detectors facing each other inside a low-background passive shield. We present coincidence gating schemes for achieving the best signal-to-noise ratios, coincidence detection efficiencies, background levels, and minimum detectable activities. The spectrometer is simulated using Geant4 to correct sample efficiencies for self-absorption effects. The device is used to measure thorium and uranium daughter activities in Brazil nuts, potting mix, and magazine paper. Our results for Brazil nuts agree with some, but not all, previous measurements. Thorium or uranium daughter activities have previously not been reported for commercial potting mix. For magazine paper, our measured activities are lower than most previously determined values.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Radiation and Isotopes - Volume 141, November 2018, Pages 24-32
نویسندگان
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