The standardization methods of radioactive sources (¹²⁵I, ¹³¹I, ^99mTc, and ¹⁸F) for calibrating nuclear medicine equipment in Indonesia

The standardization of radioactive sources (¹²⁵I, ¹³¹I, ^99mTc and ¹⁸F) to calibrate the nuclear medicine equipment had been carried out in PTKMR-BATAN. This is necessary because the radioactive sources used in the field of nuclear medicine has a very short half-life in other that to obtain a quality measurement results require special treatment. Besides that, the use of nuclear medicine techniques in Indonesia develop rapidly. All the radioactive sources were prepared by gravimetric methods. Standardization of ¹²⁵I has been carried out by photon- photon coincidence methods, while the others have been carried out by gamma spectrometry methods. The standar sources are used to calibrate a Capintec CRC-7BT radionuclide calibrator. The results shows that calibration factor for Capintec CRC-7BT dose calibrator is 1,03; 1,02; 1,06; and 1,04 for ¹²⁵I, ¹³¹I, ^99mTc and ¹⁸F respectively, by about 5 to 6% of the expanded uncertainties.