DMCA
CIEMAT/NIST STANDARDIZATION METHOD EXTENDED TO ANODE OUTPUTS FOR BETA AND ELECTRON-CAPTURE NUCLIDES
BibTeX
@MISC{Ortiz_ciemat/niststandardization,
author = {J. F. Ortiz and J. M. Los Arcos and Agustin Grad Malonda},
title = {CIEMAT/NIST STANDARDIZATION METHOD EXTENDED TO ANODE OUTPUTS FOR BETA AND ELECTRON-CAPTURE NUCLIDES},
year = {}
}
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Abstract
ABSTRACT. We present here the application of the CIEMAT/NIST method, extended with computed anodic efficiency, to the standardization of beta emitters or electron-capture nuclides, for a liquid scintillation counting system system with two photomultiplier tubes (PMT) working in summed-coincidence mode. We assume that electron amplification through all photocathode and dynode PMT stages is governed by the Poisson distribution. We tested the procedure with several samples of 45Ca and SSFe radioactive solutions, quenched with CCl4, in Optiphase HiSafeTM II scintillator. The efficiency tracing was performed with a set of 3H standard reference samples, prepared with the same scintillator, with efficiencies varying between 15 % and 50%. The final computed efficiencies for the problem samples are between 90 % and 95 % for 45Ca, or between 45 % and 50 % for SSFe, and agree with self-standardized experimental values within 0.6%. The results of the CIEMAT/NIST extended method, compared to the conventional method, show small discrepancies of <0.4 % for the full range of quenching.
Keyphrases
beta emitter standard reference sample computed anodic efficiency problem sample summed-coincidence mode dynode pmt system system several sample small discrepancy self-standardized experimental value full range efficiency tracing electron amplification conventional method final computed efficiency ssfe radioactive solution poisson distribution liquid scintillation ciemat nist electron-capture nuclides optiphase hisafetm ii scintillator ciemat nist method
