Related Experiment Video
Updated: Nov 20, 2025

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
Published on: January 30, 2020
Standardization of 223Ra by live-time anticoincidence counting and gamma-ray emission determination
R F P Simões1, C J da Silva2, R L da Silva2
1Instituto de Radioproteção e Dosimetria (IRD), Comissão Nacional de Energia Nuclear (CNEN), Laboratório Nacional de Metrologia das Radiações Ionizantes (LNMRI), Av. Salvador Allende, s/n° - Barra da Tijuca, CEP 22783-127, Rio de Janeiro, Brazil; Instituto Nacional do Câncer José Alencar Gomes da Silva (INCA), Física Médica, Praça Cruz Vermelha,n° 23, 4° Andar do Prédio Anexo - Lapa, CEP 20230-130, Rio de Janeiro, RJ, Brazil.
Abstract:
From a commercial supplier, three independent lots of an aqueous solution containing 223Ra in equilibrium with its deteriorating progeny were considered for standardization, by using live-time anticoincidence counting (LTAC) in the Laboratório Nacional de Metrologia das Radiações Ionizantes (LNMRI) Brazil. The ionization chamber calibration factors were obtained using measurements of independent lots of 223Ra in LTAC considering the absolute method in order to evaluate the constancy and reproducibility of the standardization. The calibration factors of three high-performance well-type ionization chamber systems and four commercial well-type ionization chambers were determined. The LTAC results showed that lots 2 and 3 were 1069.88 and 1097.44 kBq/kg, with corresponding relative standard uncertainties 0.12% and 0.20%, respectively. The spectrometry method results of each lot value were classified as positive by ANOVA hypothesis testing. The emission probabilities relating to the X- and γ-rays in region from 81 to 830 keV ware determined. Hence, LNMRI can provide calibration services for 223Ra.
More Related Videos
Related Concept Videos
Atomic Emission Spectroscopy: Overview
Atomic Emission Spectroscopy: Lab
Atomic Emission Spectroscopy: Instrumentation
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....

