Evaluation of the ⁹⁹Mo contamination in eluates samples generated of ^99mTc in a clinic of Recife, Brazil

This study evaluates the ⁹⁹Mo content in eluates of ⁹⁹Mo/⁹⁹m Tc generators, used in a nuclear medicine service in Recife. To do this, were collected eluates samples from 5 elution of 10 different generators using the attenuation method in own nuclear medicine service which provided routine activimeter CRC-127R model, manufactured by Capintec. The samples were measured, and the activities of ^99mTc and ⁹⁹Mo were determined and calculated the MBT (molybdenum break through) for 1^st, 3^rd, 5^th, 7^th and 9^th elution of each generator. It was observed in a sample the presence of molybdenum in the amount near the limit set by the United States Pharmacopoeia (USP), 0,15μCi/mCi). A second sample presented good high value, more than double the USP limit. The results obtained demonstrate the possibility of finding ⁹⁹Mo in the eluted solution, which reinforces the need to deploy the control test of the molybdenum content in all elution in quality control programs of service nuclear medicine