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.

从一家商业供应商处，通过使用巴西国家放射实验室实验室（LNMRI）的实时反符合计数（LTAC）技术，考虑将三批独立的，含有²²³ Ra且其后代不断恶化的平衡水溶液进行标准化。使用^223个独立批次的测量值获得电离室校准因子LTAC中的Ra考虑了绝对方法，以便评估标准化的稳定性和可重复性。确定了三个高性能阱型电离室系统和四个商用阱型电离室的校准因子。LTAC结果显示，批次2和3分别为1069.88和1097.44 kBq / kg，相应的相对标准不确定度分别为0.12％和0.20％。通过ANOVA假设检验将每个批次值的光谱法结果分类为阳性。确定了与从81到830 keV器皿中的X射线和γ射线有关的发射概率。

因此，LNMRI可以为²²³ Ra提供校准服务。