Abstract
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.
Highlights
The current trend in the field of Radionuclide Metrology is to make use of multi-systems based on liquid scintillation technique, which has the advantage of using the same information from radionuclide events together data acquisition systems based on a high-speed digitizers, where the A/D conversion is performed as close as possible to the output of the detector or preamplifier, in contrast to conventional analogue systems [1, 2]
This work presents the development of the multi-systems that uses to-double coincidence ratio (TDCR) and Coincidence 4 − methods based on liquid scintillation technique
The activity is obtained by ratio between experimental value of the double coincidence counts and theoretical double efficiency obtained by interpolating of the experimental TDCR into TDCR versus double efficiency curve from TDCR07 code, and radionuclide solution mass, to the kB value determined by use of grey filters
Summary
There is an abundant literature on the application of TDCR and Coincidence 4πβ-γ to standardization of radioactive sources They are the absolute methods that have great versatility as may be applicable to all sources that decay by simultaneous emission (intervals less than 10-10 s) of two or more particles, such as β-γ, α-γ, X, eA-γ and even pure beta emitters using a β-γ radionuclide as tracer [3,4,5,6,7]. They are reference methods to radionuclide standardizing after a large time of theoretical and experimental studies carried out by radionuclide laboratories of the National Metrology Institutes of the international BIPM network. The scintillation process occurs when a radionuclide solution is dissolved in liquid scintillator cocktail and the energy of the particles is transferred to the chemical molecules, with consequent light emission [8]
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