The EURAMET.RI(II)-S9 interlaboratory comparison of the radionuclide calibrators

At EURAMET TC-IR meeting in Madrid, March 1, 2023, it was proposed to organize a comparison on radionuclide calibrators to measure the activity of short-lived radionuclides used in nuclear medicine: F-18, Ga-67, Y-90, Tc-99 m, In-111, I-123, I-131, Sm-153, Lu-177 and Tl-201. The technical protocol was elaborated in June 2023 and after comments received from CCRI(II) and KCWG (II) it was finally approved in August 2023. The comparison took place in Prague at CMI headquarters 11-15 September 2023. Original solutions provided by manufacturers were used to prepare working solutions with which 2 mL ampoules, 5 mL ampoules, P6 vials, and Schott 10 R type1+ vials were filled. For control measurements by the gamma-ray spectrometry with a HPGe detector, samples were prepared using the same solution. For radionuclides Ga-67, Sm-153, and Lu-177, special solutions were produced, and 3.6 mL ampoules required by SIR were filled. Activity values were determined gravimetrically from activity concentration values measured by the primary method. The comparison reference values were determined from activity measurement results of a selection of participants by using the Power Moderated Mean approach.