title: Application of the CIEMAT-NIST method to plastic scintillation microspheres.
abstract: An adaptation of the MICELLE2 code was used to apply the CIEMAT-NIST tracing method to the activity calculation for radioactive solutions of pure beta emitters of different energies using plastic scintillation microspheres (PSm) and (3)H as a tracing radionuclide. Particle quenching, very important in measurements with PSm, was computed with PENELOPE using geometries formed by a heterogeneous mixture of polystyrene microspheres and water. The results obtained with PENELOPE were adapted to be included in MICELLE2, which is capable of including the energy losses due to particle quenching in the computation of the detection efficiency. The activity calculation of (63)Ni, (14)C, (36)Cl and (90)Sr/(90)Y solutions was performed with deviations of 8.8%, 1.9%, 1.4% and 2.1%, respectively. Of the different parameters evaluated, those with the greatest impact on the activity calculation are, in order of importance, the energy of the radionuclide, the degree of quenching of the sample and the packing fraction of the geometry used in the computation.
authors.affiliation: Department of Analytical Chemistry, University of Barcelona, Diagonal 645, E-08028, Barcelona, Spain. Electronic address: alex.tarancon@ub.edu.
authors.forename: A
authors.initials: A
authors.lastname: Tarancón
authors.affiliation: Department of Analytical Chemistry, University of Barcelona, Diagonal 645, E-08028, Barcelona, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Barrera
authors.affiliation: Department of Analytical Chemistry, University of Barcelona, Diagonal 645, E-08028, Barcelona, Spain.
authors.forename: L M
authors.initials: LM
authors.lastname: Santiago
authors.affiliation: Department of Analytical Chemistry, University of Barcelona, Diagonal 645, E-08028, Barcelona, Spain.
authors.forename: H
authors.initials: H
authors.lastname: Bagán
authors.affiliation: Department of Analytical Chemistry, University of Barcelona, Diagonal 645, E-08028, Barcelona, Spain.
authors.forename: J F
authors.initials: JF
authors.lastname: García
keywords: CIEMAT/NIST; MICELLE2; Particle quenching; Plastic scintillation microspheres