title: Absolute standardization of the impurity (121)Te associated to the production of the radiopharmaceutical (123)I.
abstract: (123)I is widely used for radiodiagnostic procedures. It is produced by reaction of (124)Xe (p,2n) (123)Cs →(123)Xe →(123)I in cyclotrons. (121)Te and (125)I appear in a photon energy spectrum as impurities. An activity of (121)Te was calibrated absolutely by sum-peak method and its photon emitting probability was estimated, whose results were consistent with published results.
authors.affiliation: Laboratório Nacional de Metrologia das Radiações Ionizantes (LNMRI/IRD/CNEN), Av. Salvador Allende, s/n, Recreio, CEP 22780-160 RJ, Brazil; Laboratório de Instrumentação Nuclear (LIN/PEN/COPPE/UFRJ), Caixa Postal 68509, CEP 21945-970 RJ, Brazil.
authors.forename: M T F
authors.initials: MTF
authors.lastname: Araújo
authors.affiliation: Laboratório Nacional de Metrologia das Radiações Ionizantes (LNMRI/IRD/CNEN), Av. Salvador Allende, s/n, Recreio, CEP 22780-160 RJ, Brazil.
authors.forename: R
authors.initials: R
authors.lastname: Poledna
authors.affiliation: Laboratório Nacional de Metrologia das Radiações Ionizantes (LNMRI/IRD/CNEN), Av. Salvador Allende, s/n, Recreio, CEP 22780-160 RJ, Brazil.
authors.forename: J U
authors.initials: JU
authors.lastname: Delgado
authors.affiliation: Laboratório Nacional de Metrologia das Radiações Ionizantes (LNMRI/IRD/CNEN), Av. Salvador Allende, s/n, Recreio, CEP 22780-160 RJ, Brazil.
authors.forename: R L
authors.initials: RL
authors.lastname: Silva
authors.affiliation: Laboratório Nacional de Metrologia das Radiações Ionizantes (LNMRI/IRD/CNEN), Av. Salvador Allende, s/n, Recreio, CEP 22780-160 RJ, Brazil.
authors.forename: A
authors.initials: A
authors.lastname: Iwahara
authors.affiliation: Laboratório Nacional de Metrologia das Radiações Ionizantes (LNMRI/IRD/CNEN), Av. Salvador Allende, s/n, Recreio, CEP 22780-160 RJ, Brazil.
authors.forename: C J
authors.initials: CJ
authors.lastname: da Silva
authors.affiliation: Laboratório Nacional de Metrologia das Radiações Ionizantes (LNMRI/IRD/CNEN), Av. Salvador Allende, s/n, Recreio, CEP 22780-160 RJ, Brazil.
authors.forename: L
authors.initials: L
authors.lastname: Tauhata
authors.affiliation: Laboratório Nacional de Metrologia das Radiações Ionizantes (LNMRI/IRD/CNEN), Av. Salvador Allende, s/n, Recreio, CEP 22780-160 RJ, Brazil.
authors.forename: A E
authors.initials: AE
authors.lastname: Oliveira
authors.affiliation: Laboratório Nacional de Metrologia das Radiações Ionizantes (LNMRI/IRD/CNEN), Av. Salvador Allende, s/n, Recreio, CEP 22780-160 RJ, Brazil. Electronic address: marcandida@yahoo.com.br.
authors.forename: M C M
authors.initials: MCM
authors.lastname: de Almeida
authors.affiliation: Laboratório de Instrumentação Nuclear (LIN/PEN/COPPE/UFRJ), Caixa Postal 68509, CEP 21945-970 RJ, Brazil.
authors.forename: R T
authors.initials: RT
authors.lastname: Lopes
keywords: (121)Te; Absolute standardization; Radiopharmaceutical; Sum-peak method