Development of multi-systems for measurement of radionuclide absolute activity

2021 ◽  
Vol 9 (2C) ◽  
Author(s):  
Paulo Alberto Lima da Cruz ◽  
Carlos Jose Da Silva ◽  
Anderson Leiras ◽  
Andre Luiz Lopes Quadros ◽  
Johnny Rangel ◽  
...  
Keyword(s):  
Liquid Scintillation ◽  
Standard Uncertainty ◽  
Absolute Activity ◽  
Beta Emitters ◽  
Double Coincidence ◽  
Initial Stage ◽  
Uncertainty Measurements ◽  
Standard Solutions

The development of a multi-systems triple-to-double coincidence ratio (TDCR) and coincidence 4pb-g methods, based on liquid scintillation to radionuclide standardization is presented in this work. The adjustments of multi-systems were made using standards of 3H and 14C and 60Co. The initial stage was performing measurements of pure beta-emitters 3H, 63Ni, and 90Sr90Y standard solutions by TDCR.  The results were consistent within the standard uncertainty. Measurements will be performed with a beta-gamma 60Co in a comparison to the SIR / BIPM to assess the multi-system's performance.

SCINTILLATION COUNTING WITH ORGANIC PHOSPHORS

1961 ◽  
Vol 39 (3) ◽  
pp. 711-716 ◽  
Author(s):  
B. Lionel Funt
Keyword(s):  
Liquid Scintillation ◽  
Mixed Solvent ◽  
Heterogeneous Systems ◽  
Continuous Phase ◽  
Scintillation Counting ◽  
Radioactive Material ◽  
Organic Crystals ◽  
Beta Emitters ◽  
Organic Phosphors ◽  
Solvent Systems

Current techniques employed in scintillation detection of beta emitters are reviewed. Internal liquid scintillation counting, with a number of homogeneous mixed solvent systems, is described. Heterogeneous counting systems containing radioactive material in the dispersed phase include scintillating gels, thickened scintillators, and emulsions, and a number of methods embodying direct counting of active deposits on filter paper. Heterogeneous systems with the radioactive material in the continuous phase are described and include plastic capillary counters, plastic filaments, or organic crystals wetted with aqueous solutions.

Characterization of Beta Emitters for Decommissioning

2013 ◽  
Author(s):  
Pascal Fichet ◽  
Anumaija Leskinen ◽  
Sylvie Guegan ◽  
Florence Goutelard
Keyword(s):  
Radioactive Waste ◽  
Nuclear Power ◽  
Building Materials ◽  
Liquid Scintillation ◽  
Working Condition ◽  
Nuclear Facilities ◽  
Beta Emitters ◽  
Classical Technique ◽  
Equipment Laboratory

Radioactive waste management is nowadays, after nearly 50 years of concern, a technical and economical challenge faced by existing nuclear power countries. In decommissioning of nuclear facilities after removal of the nuclear equipment (laboratory materials, glove boxes, etc.), the radioactive inventory of the various building materials is needed to state the working condition for dismantling. Thus, characterization is essential for decommissioning and moreover for radioactive waste classification and management. A radionuclide imaging technique, the Digital Autoradiography (DA), also known as storage phosphor technology, has been studied for decommissioning projects because of its advantages such low price, easy utilization and sensitivity. DA has been proven to be an efficient technic in localization of beta emitter (especially C-14 and H-3) contamination remaining in nuclear facilities under dismantling. Samples have been collected where C-14 or H-3 have been observed by DA and analyzed by the classical technique : pyrolysis followed by liquid scintillation counting. Real applications to classify potential waste coming from a laboratory under dismantling are described in this paper.

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