134 Cs activity standardization by 4πβ(LS)-γ(NaI-Tl) anticoincidence counting and submission to international reference system
| Autor: | A. da S. Laranjeira, R. Poledna, Akira Iwahara, Paulo Alberto Lima da Cruz, C.J. da Silva, R.L. da Silva, M.T.F. de Araújo, A.R.L. dos Santos, J. dos S. Loureiro, R. dos S. Gomes |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Measurement method
Radiation Standardization business.industry Nuclear engineering Liquid scintillation counting 010403 inorganic & nuclear chemistry 01 natural sciences 030218 nuclear medicine & medical imaging 0104 chemical sciences Metrology 03 medical and health sciences 0302 clinical medicine NIST Coincidence counting National standard National laboratory Nuclear medicine business Mathematics |
| Zdroj: | Applied Radiation and Isotopes. 134:316-320 |
| ISSN: | 0969-8043 |
| Popis: | From a commercial supplier a solution containing 134Cs has been standardized at National Laboratory for Ionizing Radiation Metrology (LNMRI) for the first time using three Liquid scintillation based measurement. These measurement methods are 4πβ-γ live-timed anticoincidence counting, 4πβ-γ coincidence counting and 3H-standard efficiency tracing with the CNET methods. The results obtained by anticoincidence counting was adopted as reference value and its combined uncertainty was 0.38%. The agreement of this reference value with coincidence counting and CNET methods were 0.39% and 0.34% respectively and were in consistency with each uncertainty method. The weighted mean results coincidence counting and CNET methods are also in close agreement 0.03% with anticoincidence counting method and meets the requirement of primary and national standard. This standardization was made in order to reduce the uncertainty in 134Cs measurement in Brazil and also following a request made by Bureau International des Poids and Mesures for new submission to International Reference System. The LNMRI last submission was made in 1987. Therefore from a 134Cs master solution a NIST ampoules was prepared and LNMRI/IRD submitted it to the International Reference System, Bureau International of Poids and Measures (SIR/BIPM). In this paper will be analyzed the LNMRI measurement and performance each measurement methods and also take into account the reference value of KCDB, we determined also the 134Cs gamma emission probabilities of main energy. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect