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Technetium-Tc is the most widely used radionuclide for obtaining diagnostic imaging in nuclear medicine and its demand is growing every year. In order to provide metrological traceability to producers and end users in Brazil to fulfil nuclear regulatory requirements for radiopharmaceuticals, National Laboratory of Ionizing Radiation Metrology/Institute of Radioprotection and Dosimetry attended, in 2013, an activity comparison measurement of Tc through BIPM Transfer Instrument SIRTI. The measurement results and the degree of equivalence between the key comparison reference value and LNMRI value are presented. The LNMRI result agreed with the measured value by SIRTI within one standard uncertainty. [ABSTRACT FROM AUTHOR]

The radionuclide I has been increasingly used in nuclear medicine therapy procedures. Nowadays, the I source administered to the patient is manufactured in two different geometries: solution and capsules. The purpose of this study is the accurate measurement of the activity present in a I capsule without destroys it. The methodology to determine the capsules activity is to obtain the calibration factor of an IG12 secondary standard activity measurement system based on the IG12 well-type ionization chamber set up at Brazilian national metrology laboratory for ionizing radiation (LNMRI) of institute of radiation protection and dosimetry (IRD).The result obtained, 6.4670 ± 0.0381 × 10 A Bq, is quite similar to the calibration factor of the I solution contained in the standard ampoule geometry, 6.4515 ± 0.0368 × 10 A Bq. After obtaining the calibration factor it was used to measure I therapy capsules in order to check the performance of radionuclide calibrators of some Brazilian nuclear medicine centers. [ABSTRACT FROM AUTHOR]