Activimeter “in situ” calibration methodology to 111In and 123I

The activimeter calibration has the purpose of ensure greater reliability in measurement results, hence activimeters used are commonly installed controlled areas and, some cases, with difficult access. “in situ” methodology presented this work allows its execution only displacement radioactive samples and not itself, which simplifies procedure nuclear medicine services at radiopharmaceuticals production centers, without affecting quality accuracy measurements. After application by qualified technicians, obtained results tested showed importance since factors can present correction up to 5% for 111In than 123I.