The Absolute Standardization Methods of 32P for Calibrate Nuclear Medicine Instruments in Indonesia

The absolute standardiz ation of 32 P radioactive sources employed to calibrat e nuclear medicine instruments ha s been conducted at PTKMR-BATAN. We deemed this activity to be necessary since 32 P used in the nuclear medicine field s has a short half-life , and in order to obtain a result of quality measurement, it requires a special treatment. Moreover , in Indonesia , the use of nuclear medicine techniques has develop ed rapidly. We prepared a ll the radioactive sources with a gravimetric method by using a KERN ABT 220-5DM semi-micro type scale, traceable to the International Unit System . We conducted the 32 P s tandardization by employing  a  4 πβ (PS)- γ coincidence method with 60 Co as a tracer ; meanwhile, we conducted the impurit y measurement by employing a beta spectrometer system. The result of 32 P absolute measurement was 380.05 Bq/ m g with a 0.68 -percent range uncertainty, with a k=2 cover age factor. This value was used to calibrate a “Capintec CRC-7BT” dose calibrator that was a secondary standard instrument in PTKMR-BATAN. The results show ed us that the calibration factor of the “Capintec CRC-7BT” dose calibrator was 1.12 with a 4.7 -percent uncertaint y.