The acceptances and quality control test of the system of thyroid iodine uptake coupled to PC, model DETEC-PC SNR1C-04

The thyroid iodine uptake is a diagnostic method of great importance in the study and treatment of the thyroid illnesses. The acceptances and quality control test of the system of thyroid iodine uptake coupled to PC, Model DETEC-PC SNR1C-04 manufactured by the CEADEN were made according to the procedures described in the National Manual of Quality Control in Nuclear Medicine Instruments using certified sources of 137Cs, 57Co, 133Ba and 131I, with 5% of uncertainty in the activity value. 670 V was determinate as voltage of work. For the range of energy of 122 keV up to 662 keV the energy linearity had a deviation smaller than 1%. The energy resolution was 13.91% for 131I and 11.12% for 137Cs. The behavior to the activity variation is lineal up to 500 μ Ci (R2 = 0.99) for 131I source to 20 cm of the detector. The maximum count rate was of 34.08 Kc/s. The reproducibility of the system, for 137Cs and 133Ba was smaller than 3%, the losses of count rate in the measurement of the 133Ba using the calibration for 131I was smaller than 2%, for that reason the 133Ba was select like source to made the reproducibility. 131I sources of different activities were measured (simulating patient), determining the experimental uptake and calculating the theoretical values; the absolute differences among these values were between 0.04% and 1.23%. According to obtained values and the system stability the radiometer DETEC-PC SNR1C-04 is accepted for its use like iodine uptake. (Author)