Document Detail

Implementation of the TDCR liquid scintillation method at CNEA-LMR, Argentina.
MedLine Citation:
PMID:  16890447     Owner:  NLM     Status:  MEDLINE    
During the last two years, a triple-to-double coincidence ratio (TDCR) system was assembled and adjusted at the CNEA-LMR, Argentina. The new counting system will add complementary capabilities to the absolute measurements section of the CNEA-LMR. This work describes its implementation and validation. Several checks and a set of beta-emitting standard solutions were used in order to perform the validation experiments. In preliminary measurements, a 3H LNHB solution with reference activity concentration of (119.7+/-0.9) kBq/g on 11 November 2003 was used. The CNEA-LMR TDCR counter gave, at the same reference date, an activity concentration of (120+/-1) kBq/g. Results and improvements are presented in detail. Concerning the asymmetry of the system, the quantum efficiency of the three photomultiplier tubes was studied for different operating conditions of the focusing voltage. The counter also includes an automatic system to change the efficiency by defocusing the photomultipliers and on the other hand, it was coupled to a HPGe detector to also measure beta-gamma coincidences.
Pablo Arenillas; Philippe Cassette
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Publication Detail:
Type:  Evaluation Studies; Journal Article     Date:  2006-08-04
Journal Detail:
Title:  Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine     Volume:  64     ISSN:  0969-8043     ISO Abbreviation:  Appl Radiat Isot     Publication Date:    2006 Oct-Nov
Date Detail:
Created Date:  2006-09-11     Completed Date:  2006-11-28     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9306253     Medline TA:  Appl Radiat Isot     Country:  England    
Other Details:
Languages:  eng     Pagination:  1500-4     Citation Subset:  IM    
Laboratorio de Metrología de Radioisótopos, Comisión Nacional de Energía Atómica, Argentina.
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MeSH Terms
Computer Simulation
Models, Chemical*
Radiation Dosage
Radioisotopes / analysis*,  chemistry,  standards*
Reference Standards
Reference Values
Scintillation Counting / instrumentation*,  methods*,  standards
Reg. No./Substance:

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